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mm: remove the vma linked list
Replace any vm_next use with vma_find(). Update free_pgtables(), unmap_vmas(), and zap_page_range() to use the maple tree. Use the new free_pgtables() and unmap_vmas() in do_mas_align_munmap(). At the same time, alter the loop to be more compact. Now that free_pgtables() and unmap_vmas() take a maple tree as an argument, rearrange do_mas_align_munmap() to use the new tree to hold the vmas to remove. Remove __vma_link_list() and __vma_unlink_list() as they are exclusively used to update the linked list. Drop linked list update from __insert_vm_struct(). Rework validation of tree as it was depending on the linked list. [yang.lee@linux.alibaba.com: fix one kernel-doc comment] Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=1949 Link: https://lkml.kernel.org/r/20220824021918.94116-1-yang.lee@linux.alibaba.comLink: https://lkml.kernel.org/r/20220906194824.2110408-69-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Signed-off-by: Yang Li <yang.lee@linux.alibaba.com> Tested-by: Yu Zhao <yuzhao@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: SeongJae Park <sj@kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett
Andrew Morton
parent
78ba531ff3
commit
763ecb0350
@ -1857,8 +1857,9 @@ void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
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unsigned long size);
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void zap_page_range(struct vm_area_struct *vma, unsigned long address,
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unsigned long size);
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void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
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unsigned long start, unsigned long end);
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void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
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struct vm_area_struct *start_vma, unsigned long start,
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unsigned long end);
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struct mmu_notifier_range;
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@ -408,8 +408,6 @@ struct vm_area_struct {
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unsigned long vm_end; /* The first byte after our end address
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within vm_mm. */
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/* linked list of VM areas per task, sorted by address */
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struct vm_area_struct *vm_next, *vm_prev;
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struct mm_struct *vm_mm; /* The address space we belong to. */
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/*
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@ -473,7 +471,6 @@ struct vm_area_struct {
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struct kioctx_table;
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struct mm_struct {
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struct {
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struct vm_area_struct *mmap; /* list of VMAs */
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struct maple_tree mm_mt;
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#ifdef CONFIG_MMU
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unsigned long (*get_unmapped_area) (struct file *filp,
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@ -488,7 +485,6 @@ struct mm_struct {
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unsigned long mmap_compat_legacy_base;
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#endif
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unsigned long task_size; /* size of task vm space */
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unsigned long highest_vm_end; /* highest vma end address */
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pgd_t * pgd;
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#ifdef CONFIG_MEMBARRIER
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@ -474,7 +474,6 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
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*/
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*new = data_race(*orig);
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INIT_LIST_HEAD(&new->anon_vma_chain);
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new->vm_next = new->vm_prev = NULL;
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dup_anon_vma_name(orig, new);
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}
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return new;
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@ -579,7 +578,7 @@ static void dup_mm_exe_file(struct mm_struct *mm, struct mm_struct *oldmm)
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static __latent_entropy int dup_mmap(struct mm_struct *mm,
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struct mm_struct *oldmm)
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{
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struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
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struct vm_area_struct *mpnt, *tmp;
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int retval;
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unsigned long charge = 0;
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LIST_HEAD(uf);
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@ -606,18 +605,11 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
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mm->exec_vm = oldmm->exec_vm;
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mm->stack_vm = oldmm->stack_vm;
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pprev = &mm->mmap;
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retval = ksm_fork(mm, oldmm);
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if (retval)
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goto out;
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khugepaged_fork(mm, oldmm);
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retval = mas_expected_entries(&mas, oldmm->map_count);
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if (retval)
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goto out;
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prev = NULL;
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retval = mas_expected_entries(&mas, oldmm->map_count);
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if (retval)
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goto out;
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@ -689,14 +681,6 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
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if (is_vm_hugetlb_page(tmp))
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reset_vma_resv_huge_pages(tmp);
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/*
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* Link in the new vma and copy the page table entries.
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*/
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*pprev = tmp;
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pprev = &tmp->vm_next;
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tmp->vm_prev = prev;
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prev = tmp;
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/* Link the vma into the MT */
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mas.index = tmp->vm_start;
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mas.last = tmp->vm_end - 1;
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@ -1124,7 +1108,6 @@ static void mm_init_uprobes_state(struct mm_struct *mm)
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static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
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struct user_namespace *user_ns)
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{
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mm->mmap = NULL;
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mt_init_flags(&mm->mm_mt, MM_MT_FLAGS);
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mt_set_external_lock(&mm->mm_mt, &mm->mmap_lock);
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atomic_set(&mm->mm_users, 1);
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14
mm/debug.c
14
mm/debug.c
@ -139,13 +139,11 @@ EXPORT_SYMBOL(dump_page);
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void dump_vma(const struct vm_area_struct *vma)
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{
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pr_emerg("vma %px start %px end %px\n"
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"next %px prev %px mm %px\n"
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pr_emerg("vma %px start %px end %px mm %px\n"
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"prot %lx anon_vma %px vm_ops %px\n"
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"pgoff %lx file %px private_data %px\n"
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"flags: %#lx(%pGv)\n",
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vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
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vma->vm_prev, vma->vm_mm,
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vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,
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(unsigned long)pgprot_val(vma->vm_page_prot),
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vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
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vma->vm_file, vma->vm_private_data,
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@ -155,11 +153,11 @@ EXPORT_SYMBOL(dump_vma);
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void dump_mm(const struct mm_struct *mm)
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{
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pr_emerg("mm %px mmap %px task_size %lu\n"
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pr_emerg("mm %px task_size %lu\n"
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#ifdef CONFIG_MMU
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"get_unmapped_area %px\n"
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#endif
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"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
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"mmap_base %lu mmap_legacy_base %lu\n"
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"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
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"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
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"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
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@ -183,11 +181,11 @@ void dump_mm(const struct mm_struct *mm)
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"tlb_flush_pending %d\n"
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"def_flags: %#lx(%pGv)\n",
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mm, mm->mmap, mm->task_size,
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mm, mm->task_size,
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#ifdef CONFIG_MMU
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mm->get_unmapped_area,
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#endif
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mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
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mm->mmap_base, mm->mmap_legacy_base,
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mm->pgd, atomic_read(&mm->mm_users),
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atomic_read(&mm->mm_count),
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mm_pgtables_bytes(mm),
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@ -85,8 +85,9 @@ bool __folio_end_writeback(struct folio *folio);
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void deactivate_file_folio(struct folio *folio);
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void folio_activate(struct folio *folio);
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void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
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unsigned long floor, unsigned long ceiling);
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void free_pgtables(struct mmu_gather *tlb, struct maple_tree *mt,
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struct vm_area_struct *start_vma, unsigned long floor,
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unsigned long ceiling);
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void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte);
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struct zap_details;
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@ -480,9 +481,6 @@ static inline bool is_data_mapping(vm_flags_t flags)
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}
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/* mm/util.c */
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void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
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struct vm_area_struct *prev);
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void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma);
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struct anon_vma *folio_anon_vma(struct folio *folio);
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#ifdef CONFIG_MMU
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34
mm/memory.c
34
mm/memory.c
@ -392,12 +392,21 @@ void free_pgd_range(struct mmu_gather *tlb,
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} while (pgd++, addr = next, addr != end);
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}
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void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
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unsigned long floor, unsigned long ceiling)
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void free_pgtables(struct mmu_gather *tlb, struct maple_tree *mt,
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struct vm_area_struct *vma, unsigned long floor,
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unsigned long ceiling)
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{
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while (vma) {
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struct vm_area_struct *next = vma->vm_next;
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MA_STATE(mas, mt, vma->vm_end, vma->vm_end);
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do {
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unsigned long addr = vma->vm_start;
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struct vm_area_struct *next;
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/*
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* Note: USER_PGTABLES_CEILING may be passed as ceiling and may
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* be 0. This will underflow and is okay.
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*/
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next = mas_find(&mas, ceiling - 1);
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/*
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* Hide vma from rmap and truncate_pagecache before freeing
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@ -416,7 +425,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
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while (next && next->vm_start <= vma->vm_end + PMD_SIZE
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&& !is_vm_hugetlb_page(next)) {
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vma = next;
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next = vma->vm_next;
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next = mas_find(&mas, ceiling - 1);
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unlink_anon_vmas(vma);
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unlink_file_vma(vma);
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}
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@ -424,7 +433,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
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floor, next ? next->vm_start : ceiling);
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}
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vma = next;
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}
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} while (vma);
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}
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void pmd_install(struct mm_struct *mm, pmd_t *pmd, pgtable_t *pte)
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@ -1688,6 +1697,7 @@ static void unmap_single_vma(struct mmu_gather *tlb,
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/**
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* unmap_vmas - unmap a range of memory covered by a list of vma's
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* @tlb: address of the caller's struct mmu_gather
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* @mt: the maple tree
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* @vma: the starting vma
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* @start_addr: virtual address at which to start unmapping
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* @end_addr: virtual address at which to end unmapping
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@ -1703,7 +1713,7 @@ static void unmap_single_vma(struct mmu_gather *tlb,
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* ensure that any thus-far unmapped pages are flushed before unmap_vmas()
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* drops the lock and schedules.
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*/
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void unmap_vmas(struct mmu_gather *tlb,
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void unmap_vmas(struct mmu_gather *tlb, struct maple_tree *mt,
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struct vm_area_struct *vma, unsigned long start_addr,
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unsigned long end_addr)
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{
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@ -1713,12 +1723,14 @@ void unmap_vmas(struct mmu_gather *tlb,
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/* Careful - we need to zap private pages too! */
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.even_cows = true,
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};
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MA_STATE(mas, mt, vma->vm_end, vma->vm_end);
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mmu_notifier_range_init(&range, MMU_NOTIFY_UNMAP, 0, vma, vma->vm_mm,
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start_addr, end_addr);
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mmu_notifier_invalidate_range_start(&range);
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for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next)
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do {
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unmap_single_vma(tlb, vma, start_addr, end_addr, &details);
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} while ((vma = mas_find(&mas, end_addr - 1)) != NULL);
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mmu_notifier_invalidate_range_end(&range);
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}
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@ -1733,8 +1745,11 @@ void unmap_vmas(struct mmu_gather *tlb,
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void zap_page_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long size)
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{
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struct maple_tree *mt = &vma->vm_mm->mm_mt;
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unsigned long end = start + size;
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struct mmu_notifier_range range;
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struct mmu_gather tlb;
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MA_STATE(mas, mt, vma->vm_end, vma->vm_end);
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lru_add_drain();
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mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, vma->vm_mm,
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@ -1742,8 +1757,9 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start,
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tlb_gather_mmu(&tlb, vma->vm_mm);
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update_hiwater_rss(vma->vm_mm);
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mmu_notifier_invalidate_range_start(&range);
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for ( ; vma && vma->vm_start < range.end; vma = vma->vm_next)
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do {
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unmap_single_vma(&tlb, vma, start, range.end, NULL);
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} while ((vma = mas_find(&mas, end - 1)) != NULL);
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mmu_notifier_invalidate_range_end(&range);
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tlb_finish_mmu(&tlb);
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}
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469
mm/mmap.c
469
mm/mmap.c
@ -75,9 +75,10 @@ int mmap_rnd_compat_bits __read_mostly = CONFIG_ARCH_MMAP_RND_COMPAT_BITS;
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static bool ignore_rlimit_data;
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core_param(ignore_rlimit_data, ignore_rlimit_data, bool, 0644);
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static void unmap_region(struct mm_struct *mm,
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static void unmap_region(struct mm_struct *mm, struct maple_tree *mt,
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struct vm_area_struct *vma, struct vm_area_struct *prev,
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unsigned long start, unsigned long end);
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struct vm_area_struct *next, unsigned long start,
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unsigned long end);
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static pgprot_t vm_pgprot_modify(pgprot_t oldprot, unsigned long vm_flags)
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{
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@ -130,12 +131,10 @@ void unlink_file_vma(struct vm_area_struct *vma)
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}
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/*
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* Close a vm structure and free it, returning the next.
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* Close a vm structure and free it.
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*/
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static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
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static void remove_vma(struct vm_area_struct *vma)
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{
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struct vm_area_struct *next = vma->vm_next;
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might_sleep();
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if (vma->vm_ops && vma->vm_ops->close)
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vma->vm_ops->close(vma);
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@ -143,7 +142,6 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
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fput(vma->vm_file);
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mpol_put(vma_policy(vma));
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vm_area_free(vma);
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return next;
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}
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/*
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@ -168,8 +166,7 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,
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unsigned long newbrk, unsigned long oldbrk,
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struct list_head *uf);
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static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *brkvma,
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unsigned long addr, unsigned long request,
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unsigned long flags);
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unsigned long addr, unsigned long request, unsigned long flags);
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SYSCALL_DEFINE1(brk, unsigned long, brk)
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{
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unsigned long newbrk, oldbrk, origbrk;
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@ -238,7 +235,6 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
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* before calling do_brk_munmap().
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*/
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mm->brk = brk;
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mas.last = oldbrk - 1;
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ret = do_brk_munmap(&mas, brkvma, newbrk, oldbrk, &uf);
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if (ret == 1) {
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downgraded = true;
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@ -293,44 +289,21 @@ extern void mt_dump(const struct maple_tree *mt);
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static void validate_mm_mt(struct mm_struct *mm)
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{
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struct maple_tree *mt = &mm->mm_mt;
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struct vm_area_struct *vma_mt, *vma = mm->mmap;
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struct vm_area_struct *vma_mt;
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MA_STATE(mas, mt, 0, 0);
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mt_validate(&mm->mm_mt);
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mas_for_each(&mas, vma_mt, ULONG_MAX) {
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if (xa_is_zero(vma_mt))
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continue;
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if (!vma)
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break;
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if ((vma != vma_mt) ||
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(vma->vm_start != vma_mt->vm_start) ||
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(vma->vm_end != vma_mt->vm_end) ||
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(vma->vm_start != mas.index) ||
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(vma->vm_end - 1 != mas.last)) {
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if ((vma_mt->vm_start != mas.index) ||
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(vma_mt->vm_end - 1 != mas.last)) {
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pr_emerg("issue in %s\n", current->comm);
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dump_stack();
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dump_vma(vma_mt);
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pr_emerg("and vm_next\n");
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dump_vma(vma->vm_next);
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pr_emerg("mt piv: %p %lu - %lu\n", vma_mt,
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mas.index, mas.last);
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pr_emerg("mt vma: %p %lu - %lu\n", vma_mt,
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vma_mt->vm_start, vma_mt->vm_end);
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if (vma->vm_prev) {
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pr_emerg("ll prev: %p %lu - %lu\n",
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vma->vm_prev, vma->vm_prev->vm_start,
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vma->vm_prev->vm_end);
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}
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pr_emerg("ll vma: %p %lu - %lu\n", vma,
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vma->vm_start, vma->vm_end);
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if (vma->vm_next) {
|
||||
pr_emerg("ll next: %p %lu - %lu\n",
|
||||
vma->vm_next, vma->vm_next->vm_start,
|
||||
vma->vm_next->vm_end);
|
||||
}
|
||||
|
||||
mt_dump(mas.tree);
|
||||
if (vma_mt->vm_end != mas.last + 1) {
|
||||
@ -347,23 +320,19 @@ static void validate_mm_mt(struct mm_struct *mm)
|
||||
}
|
||||
VM_BUG_ON_MM(vma_mt->vm_start != mas.index, mm);
|
||||
}
|
||||
VM_BUG_ON(vma != vma_mt);
|
||||
vma = vma->vm_next;
|
||||
|
||||
}
|
||||
VM_BUG_ON(vma);
|
||||
}
|
||||
|
||||
static void validate_mm(struct mm_struct *mm)
|
||||
{
|
||||
int bug = 0;
|
||||
int i = 0;
|
||||
unsigned long highest_address = 0;
|
||||
struct vm_area_struct *vma = mm->mmap;
|
||||
struct vm_area_struct *vma;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
|
||||
validate_mm_mt(mm);
|
||||
|
||||
while (vma) {
|
||||
mas_for_each(&mas, vma, ULONG_MAX) {
|
||||
#ifdef CONFIG_DEBUG_VM_RB
|
||||
struct anon_vma *anon_vma = vma->anon_vma;
|
||||
struct anon_vma_chain *avc;
|
||||
@ -375,18 +344,10 @@ static void validate_mm(struct mm_struct *mm)
|
||||
anon_vma_unlock_read(anon_vma);
|
||||
}
|
||||
#endif
|
||||
|
||||
highest_address = vm_end_gap(vma);
|
||||
vma = vma->vm_next;
|
||||
i++;
|
||||
}
|
||||
if (i != mm->map_count) {
|
||||
pr_emerg("map_count %d vm_next %d\n", mm->map_count, i);
|
||||
bug = 1;
|
||||
}
|
||||
if (highest_address != mm->highest_vm_end) {
|
||||
pr_emerg("mm->highest_vm_end %lx, found %lx\n",
|
||||
mm->highest_vm_end, highest_address);
|
||||
pr_emerg("map_count %d mas_for_each %d\n", mm->map_count, i);
|
||||
bug = 1;
|
||||
}
|
||||
VM_BUG_ON_MM(bug, mm);
|
||||
@ -446,29 +407,13 @@ bool range_has_overlap(struct mm_struct *mm, unsigned long start,
|
||||
struct vm_area_struct *existing;
|
||||
|
||||
MA_STATE(mas, &mm->mm_mt, start, start);
|
||||
rcu_read_lock();
|
||||
existing = mas_find(&mas, end - 1);
|
||||
*pprev = mas_prev(&mas, 0);
|
||||
rcu_read_unlock();
|
||||
return existing ? true : false;
|
||||
}
|
||||
|
||||
/*
|
||||
* __vma_next() - Get the next VMA.
|
||||
* @mm: The mm_struct.
|
||||
* @vma: The current vma.
|
||||
*
|
||||
* If @vma is NULL, return the first vma in the mm.
|
||||
*
|
||||
* Returns: The next VMA after @vma.
|
||||
*/
|
||||
static inline struct vm_area_struct *__vma_next(struct mm_struct *mm,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
if (!vma)
|
||||
return mm->mmap;
|
||||
|
||||
return vma->vm_next;
|
||||
}
|
||||
|
||||
static unsigned long count_vma_pages_range(struct mm_struct *mm,
|
||||
unsigned long addr, unsigned long end)
|
||||
{
|
||||
@ -553,8 +498,7 @@ static inline void vma_mas_szero(struct ma_state *mas, unsigned long start,
|
||||
mas_store_prealloc(mas, NULL);
|
||||
}
|
||||
|
||||
static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
struct vm_area_struct *prev)
|
||||
static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
{
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
struct address_space *mapping = NULL;
|
||||
@ -568,7 +512,6 @@ static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
}
|
||||
|
||||
vma_mas_store(vma, &mas);
|
||||
__vma_link_list(mm, vma, prev);
|
||||
__vma_link_file(vma);
|
||||
|
||||
if (mapping)
|
||||
@ -579,22 +522,6 @@ static int vma_link(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper for vma_adjust() in the split_vma insert case: insert a vma into the
|
||||
* mm's list and the mm tree. It has already been inserted into the interval tree.
|
||||
*/
|
||||
static void __insert_vm_struct(struct mm_struct *mm, struct ma_state *mas,
|
||||
struct vm_area_struct *vma, unsigned long location)
|
||||
{
|
||||
struct vm_area_struct *prev;
|
||||
|
||||
mas_set(mas, location);
|
||||
prev = mas_prev(mas, 0);
|
||||
vma_mas_store(vma, mas);
|
||||
__vma_link_list(mm, vma, prev);
|
||||
mm->map_count++;
|
||||
}
|
||||
|
||||
/*
|
||||
* vma_expand - Expand an existing VMA
|
||||
*
|
||||
@ -675,15 +602,8 @@ inline int vma_expand(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
}
|
||||
|
||||
/* Expanding over the next vma */
|
||||
if (remove_next) {
|
||||
/* Remove from mm linked list - also updates highest_vm_end */
|
||||
__vma_unlink_list(mm, next);
|
||||
|
||||
if (file)
|
||||
__remove_shared_vm_struct(next, file, mapping);
|
||||
|
||||
} else if (!next) {
|
||||
mm->highest_vm_end = vm_end_gap(vma);
|
||||
if (remove_next && file) {
|
||||
__remove_shared_vm_struct(next, file, mapping);
|
||||
}
|
||||
|
||||
if (anon_vma) {
|
||||
@ -738,7 +658,6 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
||||
int remove_next = 0;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
struct vm_area_struct *exporter = NULL, *importer = NULL;
|
||||
unsigned long ll_prev = vma->vm_start; /* linked list prev. */
|
||||
|
||||
if (next && !insert) {
|
||||
if (end >= next->vm_end) {
|
||||
@ -773,7 +692,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
||||
next_next = find_vma(mm, next->vm_end);
|
||||
|
||||
VM_WARN_ON(remove_next == 2 &&
|
||||
end != next->vm_next->vm_end);
|
||||
end != next_next->vm_end);
|
||||
}
|
||||
|
||||
exporter = next;
|
||||
@ -784,7 +703,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
||||
* next, if the vma overlaps with it.
|
||||
*/
|
||||
if (remove_next == 2 && !next->anon_vma)
|
||||
exporter = next->vm_next;
|
||||
exporter = next_next;
|
||||
|
||||
} else if (end > next->vm_start) {
|
||||
/*
|
||||
@ -879,17 +798,14 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
||||
if (vma->vm_end > end) {
|
||||
if (!insert || (insert->vm_start != end)) {
|
||||
vma_mas_szero(&mas, end, vma->vm_end);
|
||||
mas_reset(&mas);
|
||||
VM_WARN_ON(insert &&
|
||||
insert->vm_end < vma->vm_end);
|
||||
} else if (insert->vm_start == end) {
|
||||
ll_prev = vma->vm_end;
|
||||
}
|
||||
} else {
|
||||
vma_changed = true;
|
||||
}
|
||||
vma->vm_end = end;
|
||||
if (!next)
|
||||
mm->highest_vm_end = vm_end_gap(vma);
|
||||
}
|
||||
|
||||
if (vma_changed)
|
||||
@ -909,29 +825,19 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start,
|
||||
flush_dcache_mmap_unlock(mapping);
|
||||
}
|
||||
|
||||
if (remove_next) {
|
||||
/*
|
||||
* vma_merge has merged next into vma, and needs
|
||||
* us to remove next before dropping the locks.
|
||||
* Since we have expanded over this vma, the maple tree will
|
||||
* have overwritten by storing the value
|
||||
*/
|
||||
__vma_unlink_list(mm, next);
|
||||
if (remove_next && file) {
|
||||
__remove_shared_vm_struct(next, file, mapping);
|
||||
if (remove_next == 2)
|
||||
__vma_unlink_list(mm, next_next);
|
||||
|
||||
if (file) {
|
||||
__remove_shared_vm_struct(next, file, mapping);
|
||||
if (remove_next == 2)
|
||||
__remove_shared_vm_struct(next_next, file, mapping);
|
||||
}
|
||||
__remove_shared_vm_struct(next_next, file, mapping);
|
||||
} else if (insert) {
|
||||
/*
|
||||
* split_vma has split insert from vma, and needs
|
||||
* us to insert it before dropping the locks
|
||||
* (it may either follow vma or precede it).
|
||||
*/
|
||||
__insert_vm_struct(mm, &mas, insert, ll_prev);
|
||||
mas_reset(&mas);
|
||||
vma_mas_store(insert, &mas);
|
||||
mm->map_count++;
|
||||
}
|
||||
|
||||
if (anon_vma) {
|
||||
@ -965,54 +871,12 @@ again:
|
||||
|
||||
/*
|
||||
* In mprotect's case 6 (see comments on vma_merge),
|
||||
* we must remove another next too. It would clutter
|
||||
* up the code too much to do both in one go.
|
||||
* we must remove next_next too.
|
||||
*/
|
||||
if (remove_next != 3) {
|
||||
/*
|
||||
* If "next" was removed and vma->vm_end was
|
||||
* expanded (up) over it, in turn
|
||||
* "next->vm_prev->vm_end" changed and the
|
||||
* "vma->vm_next" gap must be updated.
|
||||
*/
|
||||
next = next_next;
|
||||
} else {
|
||||
/*
|
||||
* For the scope of the comment "next" and
|
||||
* "vma" considered pre-swap(): if "vma" was
|
||||
* removed, next->vm_start was expanded (down)
|
||||
* over it and the "next" gap must be updated.
|
||||
* Because of the swap() the post-swap() "vma"
|
||||
* actually points to pre-swap() "next"
|
||||
* (post-swap() "next" as opposed is now a
|
||||
* dangling pointer).
|
||||
*/
|
||||
next = vma;
|
||||
}
|
||||
if (remove_next == 2) {
|
||||
remove_next = 1;
|
||||
next = next_next;
|
||||
goto again;
|
||||
} else if (!next) {
|
||||
/*
|
||||
* If remove_next == 2 we obviously can't
|
||||
* reach this path.
|
||||
*
|
||||
* If remove_next == 3 we can't reach this
|
||||
* path because pre-swap() next is always not
|
||||
* NULL. pre-swap() "next" is not being
|
||||
* removed and its next->vm_end is not altered
|
||||
* (and furthermore "end" already matches
|
||||
* next->vm_end in remove_next == 3).
|
||||
*
|
||||
* We reach this only in the remove_next == 1
|
||||
* case if the "next" vma that was removed was
|
||||
* the highest vma of the mm. However in such
|
||||
* case next->vm_end == "end" and the extended
|
||||
* "vma" has vma->vm_end == next->vm_end so
|
||||
* mm->highest_vm_end doesn't need any update
|
||||
* in remove_next == 1 case.
|
||||
*/
|
||||
VM_WARN_ON(mm->highest_vm_end != vm_end_gap(vma));
|
||||
}
|
||||
}
|
||||
if (insert && file)
|
||||
@ -1020,6 +884,7 @@ again:
|
||||
|
||||
mas_destroy(&mas);
|
||||
validate_mm(mm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1179,10 +1044,10 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
|
||||
if (vm_flags & VM_SPECIAL)
|
||||
return NULL;
|
||||
|
||||
next = __vma_next(mm, prev);
|
||||
next = find_vma(mm, prev ? prev->vm_end : 0);
|
||||
area = next;
|
||||
if (area && area->vm_end == end) /* cases 6, 7, 8 */
|
||||
next = next->vm_next;
|
||||
next = find_vma(mm, next->vm_end);
|
||||
|
||||
/* verify some invariant that must be enforced by the caller */
|
||||
VM_WARN_ON(prev && addr <= prev->vm_start);
|
||||
@ -1316,18 +1181,24 @@ static struct anon_vma *reusable_anon_vma(struct vm_area_struct *old, struct vm_
|
||||
*/
|
||||
struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma)
|
||||
{
|
||||
MA_STATE(mas, &vma->vm_mm->mm_mt, vma->vm_end, vma->vm_end);
|
||||
struct anon_vma *anon_vma = NULL;
|
||||
struct vm_area_struct *prev, *next;
|
||||
|
||||
/* Try next first. */
|
||||
if (vma->vm_next) {
|
||||
anon_vma = reusable_anon_vma(vma->vm_next, vma, vma->vm_next);
|
||||
next = mas_walk(&mas);
|
||||
if (next) {
|
||||
anon_vma = reusable_anon_vma(next, vma, next);
|
||||
if (anon_vma)
|
||||
return anon_vma;
|
||||
}
|
||||
|
||||
prev = mas_prev(&mas, 0);
|
||||
VM_BUG_ON_VMA(prev != vma, vma);
|
||||
prev = mas_prev(&mas, 0);
|
||||
/* Try prev next. */
|
||||
if (vma->vm_prev)
|
||||
anon_vma = reusable_anon_vma(vma->vm_prev, vma->vm_prev, vma);
|
||||
if (prev)
|
||||
anon_vma = reusable_anon_vma(prev, prev, vma);
|
||||
|
||||
/*
|
||||
* We might reach here with anon_vma == NULL if we can't find
|
||||
@ -2101,8 +1972,8 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
|
||||
if (gap_addr < address || gap_addr > TASK_SIZE)
|
||||
gap_addr = TASK_SIZE;
|
||||
|
||||
next = vma->vm_next;
|
||||
if (next && next->vm_start < gap_addr && vma_is_accessible(next)) {
|
||||
next = find_vma_intersection(mm, vma->vm_end, gap_addr);
|
||||
if (next && vma_is_accessible(next)) {
|
||||
if (!(next->vm_flags & VM_GROWSUP))
|
||||
return -ENOMEM;
|
||||
/* Check that both stack segments have the same anon_vma? */
|
||||
@ -2153,8 +2024,6 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
|
||||
/* Overwrite old entry in mtree. */
|
||||
vma_mas_store(vma, &mas);
|
||||
anon_vma_interval_tree_post_update_vma(vma);
|
||||
if (!vma->vm_next)
|
||||
mm->highest_vm_end = vm_end_gap(vma);
|
||||
spin_unlock(&mm->page_table_lock);
|
||||
|
||||
perf_event_mmap(vma);
|
||||
@ -2174,16 +2043,16 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
|
||||
int expand_downwards(struct vm_area_struct *vma, unsigned long address)
|
||||
{
|
||||
struct mm_struct *mm = vma->vm_mm;
|
||||
MA_STATE(mas, &mm->mm_mt, vma->vm_start, vma->vm_start);
|
||||
struct vm_area_struct *prev;
|
||||
int error = 0;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
|
||||
address &= PAGE_MASK;
|
||||
if (address < mmap_min_addr)
|
||||
return -EPERM;
|
||||
|
||||
/* Enforce stack_guard_gap */
|
||||
prev = vma->vm_prev;
|
||||
prev = mas_prev(&mas, 0);
|
||||
/* Check that both stack segments have the same anon_vma? */
|
||||
if (prev && !(prev->vm_flags & VM_GROWSDOWN) &&
|
||||
vma_is_accessible(prev)) {
|
||||
@ -2318,25 +2187,26 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
|
||||
EXPORT_SYMBOL_GPL(find_extend_vma);
|
||||
|
||||
/*
|
||||
* Ok - we have the memory areas we should free on the vma list,
|
||||
* so release them, and do the vma updates.
|
||||
* Ok - we have the memory areas we should free on a maple tree so release them,
|
||||
* and do the vma updates.
|
||||
*
|
||||
* Called with the mm semaphore held.
|
||||
*/
|
||||
static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
static inline void remove_mt(struct mm_struct *mm, struct ma_state *mas)
|
||||
{
|
||||
unsigned long nr_accounted = 0;
|
||||
struct vm_area_struct *vma;
|
||||
|
||||
/* Update high watermark before we lower total_vm */
|
||||
update_hiwater_vm(mm);
|
||||
do {
|
||||
mas_for_each(mas, vma, ULONG_MAX) {
|
||||
long nrpages = vma_pages(vma);
|
||||
|
||||
if (vma->vm_flags & VM_ACCOUNT)
|
||||
nr_accounted += nrpages;
|
||||
vm_stat_account(mm, vma->vm_flags, -nrpages);
|
||||
vma = remove_vma(vma);
|
||||
} while (vma);
|
||||
remove_vma(vma);
|
||||
}
|
||||
vm_unacct_memory(nr_accounted);
|
||||
validate_mm(mm);
|
||||
}
|
||||
@ -2346,18 +2216,18 @@ static void remove_vma_list(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
*
|
||||
* Called with the mm semaphore held.
|
||||
*/
|
||||
static void unmap_region(struct mm_struct *mm,
|
||||
static void unmap_region(struct mm_struct *mm, struct maple_tree *mt,
|
||||
struct vm_area_struct *vma, struct vm_area_struct *prev,
|
||||
struct vm_area_struct *next,
|
||||
unsigned long start, unsigned long end)
|
||||
{
|
||||
struct vm_area_struct *next = __vma_next(mm, prev);
|
||||
struct mmu_gather tlb;
|
||||
|
||||
lru_add_drain();
|
||||
tlb_gather_mmu(&tlb, mm);
|
||||
update_hiwater_rss(mm);
|
||||
unmap_vmas(&tlb, vma, start, end);
|
||||
free_pgtables(&tlb, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
|
||||
unmap_vmas(&tlb, mt, vma, start, end);
|
||||
free_pgtables(&tlb, mt, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
|
||||
next ? next->vm_start : USER_PGTABLES_CEILING);
|
||||
tlb_finish_mmu(&tlb);
|
||||
}
|
||||
@ -2444,24 +2314,17 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
return __split_vma(mm, vma, addr, new_below);
|
||||
}
|
||||
|
||||
static inline int
|
||||
unlock_range(struct vm_area_struct *start, struct vm_area_struct **tail,
|
||||
unsigned long limit)
|
||||
static inline int munmap_sidetree(struct vm_area_struct *vma,
|
||||
struct ma_state *mas_detach)
|
||||
{
|
||||
struct mm_struct *mm = start->vm_mm;
|
||||
struct vm_area_struct *tmp = start;
|
||||
int count = 0;
|
||||
mas_set_range(mas_detach, vma->vm_start, vma->vm_end - 1);
|
||||
if (mas_store_gfp(mas_detach, vma, GFP_KERNEL))
|
||||
return -ENOMEM;
|
||||
|
||||
while (tmp && tmp->vm_start < limit) {
|
||||
*tail = tmp;
|
||||
count++;
|
||||
if (tmp->vm_flags & VM_LOCKED)
|
||||
mm->locked_vm -= vma_pages(tmp);
|
||||
if (vma->vm_flags & VM_LOCKED)
|
||||
vma->vm_mm->locked_vm -= vma_pages(vma);
|
||||
|
||||
tmp = tmp->vm_next;
|
||||
}
|
||||
|
||||
return count;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -2481,9 +2344,13 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
struct mm_struct *mm, unsigned long start,
|
||||
unsigned long end, struct list_head *uf, bool downgrade)
|
||||
{
|
||||
struct vm_area_struct *prev, *last;
|
||||
struct vm_area_struct *prev, *next = NULL;
|
||||
struct maple_tree mt_detach;
|
||||
int count = 0;
|
||||
int error = -ENOMEM;
|
||||
/* we have start < vma->vm_end */
|
||||
MA_STATE(mas_detach, &mt_detach, 0, 0);
|
||||
mt_init_flags(&mt_detach, MT_FLAGS_LOCK_EXTERN);
|
||||
mt_set_external_lock(&mt_detach, &mm->mmap_lock);
|
||||
|
||||
if (mas_preallocate(mas, vma, GFP_KERNEL))
|
||||
return -ENOMEM;
|
||||
@ -2496,6 +2363,8 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
* unmapped vm_area_struct will remain in use: so lower split_vma
|
||||
* places tmp vma above, and higher split_vma places tmp vma below.
|
||||
*/
|
||||
|
||||
/* Does it split the first one? */
|
||||
if (start > vma->vm_start) {
|
||||
|
||||
/*
|
||||
@ -2506,35 +2375,60 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count)
|
||||
goto map_count_exceeded;
|
||||
|
||||
/*
|
||||
* mas_pause() is not needed since mas->index needs to be set
|
||||
* differently than vma->vm_end anyways.
|
||||
*/
|
||||
error = __split_vma(mm, vma, start, 0);
|
||||
if (error)
|
||||
goto split_failed;
|
||||
goto start_split_failed;
|
||||
|
||||
prev = vma;
|
||||
vma = __vma_next(mm, prev);
|
||||
mas->index = start;
|
||||
mas_reset(mas);
|
||||
} else {
|
||||
prev = vma->vm_prev;
|
||||
mas_set(mas, start);
|
||||
vma = mas_walk(mas);
|
||||
}
|
||||
|
||||
if (vma->vm_end >= end)
|
||||
last = vma;
|
||||
else
|
||||
last = find_vma_intersection(mm, end - 1, end);
|
||||
prev = mas_prev(mas, 0);
|
||||
if (unlikely((!prev)))
|
||||
mas_set(mas, start);
|
||||
|
||||
/* Does it split the last one? */
|
||||
if (last && end < last->vm_end) {
|
||||
error = __split_vma(mm, last, end, 1);
|
||||
/*
|
||||
* Detach a range of VMAs from the mm. Using next as a temp variable as
|
||||
* it is always overwritten.
|
||||
*/
|
||||
mas_for_each(mas, next, end - 1) {
|
||||
/* Does it split the end? */
|
||||
if (next->vm_end > end) {
|
||||
struct vm_area_struct *split;
|
||||
|
||||
error = __split_vma(mm, next, end, 1);
|
||||
if (error)
|
||||
goto end_split_failed;
|
||||
|
||||
mas_set(mas, end);
|
||||
split = mas_prev(mas, 0);
|
||||
error = munmap_sidetree(split, &mas_detach);
|
||||
if (error)
|
||||
goto munmap_sidetree_failed;
|
||||
|
||||
count++;
|
||||
if (vma == next)
|
||||
vma = split;
|
||||
break;
|
||||
}
|
||||
error = munmap_sidetree(next, &mas_detach);
|
||||
if (error)
|
||||
goto split_failed;
|
||||
goto munmap_sidetree_failed;
|
||||
|
||||
if (vma == last)
|
||||
vma = __vma_next(mm, prev);
|
||||
mas_reset(mas);
|
||||
count++;
|
||||
#ifdef CONFIG_DEBUG_VM_MAPLE_TREE
|
||||
BUG_ON(next->vm_start < start);
|
||||
BUG_ON(next->vm_start > end);
|
||||
#endif
|
||||
}
|
||||
|
||||
if (!next)
|
||||
next = mas_next(mas, ULONG_MAX);
|
||||
|
||||
if (unlikely(uf)) {
|
||||
/*
|
||||
* If userfaultfd_unmap_prep returns an error the vmas
|
||||
@ -2551,35 +2445,36 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
goto userfaultfd_error;
|
||||
}
|
||||
|
||||
/*
|
||||
* unlock any mlock()ed ranges before detaching vmas, count the number
|
||||
* of VMAs to be dropped, and return the tail entry of the affected
|
||||
* area.
|
||||
*/
|
||||
mm->map_count -= unlock_range(vma, &last, end);
|
||||
/* Drop removed area from the tree */
|
||||
/* Point of no return */
|
||||
mas_set_range(mas, start, end - 1);
|
||||
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
|
||||
/* Make sure no VMAs are about to be lost. */
|
||||
{
|
||||
MA_STATE(test, &mt_detach, start, end - 1);
|
||||
struct vm_area_struct *vma_mas, *vma_test;
|
||||
int test_count = 0;
|
||||
|
||||
rcu_read_lock();
|
||||
vma_test = mas_find(&test, end - 1);
|
||||
mas_for_each(mas, vma_mas, end - 1) {
|
||||
BUG_ON(vma_mas != vma_test);
|
||||
test_count++;
|
||||
vma_test = mas_next(&test, end - 1);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
BUG_ON(count != test_count);
|
||||
mas_set_range(mas, start, end - 1);
|
||||
}
|
||||
#endif
|
||||
mas_store_prealloc(mas, NULL);
|
||||
|
||||
/* Detach vmas from the MM linked list */
|
||||
vma->vm_prev = NULL;
|
||||
if (prev)
|
||||
prev->vm_next = last->vm_next;
|
||||
else
|
||||
mm->mmap = last->vm_next;
|
||||
|
||||
if (last->vm_next) {
|
||||
last->vm_next->vm_prev = prev;
|
||||
last->vm_next = NULL;
|
||||
} else
|
||||
mm->highest_vm_end = prev ? vm_end_gap(prev) : 0;
|
||||
|
||||
mm->map_count -= count;
|
||||
/*
|
||||
* Do not downgrade mmap_lock if we are next to VM_GROWSDOWN or
|
||||
* VM_GROWSUP VMA. Such VMAs can change their size under
|
||||
* down_read(mmap_lock) and collide with the VMA we are about to unmap.
|
||||
*/
|
||||
if (downgrade) {
|
||||
if (last && (last->vm_flags & VM_GROWSDOWN))
|
||||
if (next && (next->vm_flags & VM_GROWSDOWN))
|
||||
downgrade = false;
|
||||
else if (prev && (prev->vm_flags & VM_GROWSUP))
|
||||
downgrade = false;
|
||||
@ -2587,18 +2482,22 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
mmap_write_downgrade(mm);
|
||||
}
|
||||
|
||||
unmap_region(mm, vma, prev, start, end);
|
||||
|
||||
/* Fix up all other VM information */
|
||||
remove_vma_list(mm, vma);
|
||||
unmap_region(mm, &mt_detach, vma, prev, next, start, end);
|
||||
/* Statistics and freeing VMAs */
|
||||
mas_set(&mas_detach, start);
|
||||
remove_mt(mm, &mas_detach);
|
||||
__mt_destroy(&mt_detach);
|
||||
|
||||
|
||||
validate_mm(mm);
|
||||
return downgrade ? 1 : 0;
|
||||
|
||||
map_count_exceeded:
|
||||
split_failed:
|
||||
userfaultfd_error:
|
||||
munmap_sidetree_failed:
|
||||
end_split_failed:
|
||||
__mt_destroy(&mt_detach);
|
||||
start_split_failed:
|
||||
map_count_exceeded:
|
||||
mas_destroy(mas);
|
||||
return error;
|
||||
}
|
||||
@ -2833,7 +2732,6 @@ cannot_expand:
|
||||
i_mmap_lock_write(vma->vm_file->f_mapping);
|
||||
|
||||
vma_mas_store(vma, &mas);
|
||||
__vma_link_list(mm, vma, prev);
|
||||
mm->map_count++;
|
||||
if (vma->vm_file) {
|
||||
if (vma->vm_flags & VM_SHARED)
|
||||
@ -2891,7 +2789,7 @@ unmap_and_free_vma:
|
||||
vma->vm_file = NULL;
|
||||
|
||||
/* Undo any partial mapping done by a device driver. */
|
||||
unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
|
||||
unmap_region(mm, mas.tree, vma, prev, next, vma->vm_start, vma->vm_end);
|
||||
if (vm_flags & VM_SHARED)
|
||||
mapping_unmap_writable(file->f_mapping);
|
||||
free_vma:
|
||||
@ -2979,11 +2877,12 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
|
||||
goto out;
|
||||
|
||||
if (start + size > vma->vm_end) {
|
||||
struct vm_area_struct *next;
|
||||
VMA_ITERATOR(vmi, mm, vma->vm_end);
|
||||
struct vm_area_struct *next, *prev = vma;
|
||||
|
||||
for (next = vma->vm_next; next; next = next->vm_next) {
|
||||
for_each_vma_range(vmi, next, start + size) {
|
||||
/* hole between vmas ? */
|
||||
if (next->vm_start != next->vm_prev->vm_end)
|
||||
if (next->vm_start != prev->vm_end)
|
||||
goto out;
|
||||
|
||||
if (next->vm_file != vma->vm_file)
|
||||
@ -2992,8 +2891,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
|
||||
if (next->vm_flags != vma->vm_flags)
|
||||
goto out;
|
||||
|
||||
if (start + size <= next->vm_end)
|
||||
break;
|
||||
prev = next;
|
||||
}
|
||||
|
||||
if (!next)
|
||||
@ -3060,11 +2958,9 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
* do some brk-specific accounting here.
|
||||
*/
|
||||
static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
unsigned long addr, unsigned long len,
|
||||
unsigned long flags)
|
||||
unsigned long addr, unsigned long len, unsigned long flags)
|
||||
{
|
||||
struct mm_struct *mm = current->mm;
|
||||
struct vm_area_struct *prev = NULL;
|
||||
|
||||
validate_mm_mt(mm);
|
||||
/*
|
||||
@ -3107,7 +3003,6 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
khugepaged_enter_vma(vma, flags);
|
||||
goto out;
|
||||
}
|
||||
prev = vma;
|
||||
|
||||
/* create a vma struct for an anonymous mapping */
|
||||
vma = vm_area_alloc(mm);
|
||||
@ -3124,10 +3019,6 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
|
||||
if (mas_store_gfp(mas, vma, GFP_KERNEL))
|
||||
goto mas_store_fail;
|
||||
|
||||
if (!prev)
|
||||
prev = mas_prev(mas, 0);
|
||||
|
||||
__vma_link_list(mm, vma, prev);
|
||||
mm->map_count++;
|
||||
out:
|
||||
perf_event_mmap(vma);
|
||||
@ -3136,7 +3027,7 @@ out:
|
||||
if (flags & VM_LOCKED)
|
||||
mm->locked_vm += (len >> PAGE_SHIFT);
|
||||
vma->vm_flags |= VM_SOFTDIRTY;
|
||||
validate_mm_mt(mm);
|
||||
validate_mm(mm);
|
||||
return 0;
|
||||
|
||||
mas_store_fail:
|
||||
@ -3217,6 +3108,8 @@ void exit_mmap(struct mm_struct *mm)
|
||||
struct mmu_gather tlb;
|
||||
struct vm_area_struct *vma;
|
||||
unsigned long nr_accounted = 0;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
int count = 0;
|
||||
|
||||
/* mm's last user has gone, and its about to be pulled down */
|
||||
mmu_notifier_release(mm);
|
||||
@ -3241,7 +3134,7 @@ void exit_mmap(struct mm_struct *mm)
|
||||
mmap_write_lock(mm);
|
||||
arch_exit_mmap(mm);
|
||||
|
||||
vma = mm->mmap;
|
||||
vma = mas_find(&mas, ULONG_MAX);
|
||||
if (!vma) {
|
||||
/* Can happen if dup_mmap() received an OOM */
|
||||
mmap_write_unlock(mm);
|
||||
@ -3252,22 +3145,29 @@ void exit_mmap(struct mm_struct *mm)
|
||||
flush_cache_mm(mm);
|
||||
tlb_gather_mmu_fullmm(&tlb, mm);
|
||||
/* update_hiwater_rss(mm) here? but nobody should be looking */
|
||||
/* Use -1 here to ensure all VMAs in the mm are unmapped */
|
||||
unmap_vmas(&tlb, vma, 0, -1);
|
||||
free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING);
|
||||
/* Use ULONG_MAX here to ensure all VMAs in the mm are unmapped */
|
||||
unmap_vmas(&tlb, &mm->mm_mt, vma, 0, ULONG_MAX);
|
||||
free_pgtables(&tlb, &mm->mm_mt, vma, FIRST_USER_ADDRESS,
|
||||
USER_PGTABLES_CEILING);
|
||||
tlb_finish_mmu(&tlb);
|
||||
|
||||
/* Walk the list again, actually closing and freeing it. */
|
||||
while (vma) {
|
||||
/*
|
||||
* Walk the list again, actually closing and freeing it, with preemption
|
||||
* enabled, without holding any MM locks besides the unreachable
|
||||
* mmap_write_lock.
|
||||
*/
|
||||
do {
|
||||
if (vma->vm_flags & VM_ACCOUNT)
|
||||
nr_accounted += vma_pages(vma);
|
||||
vma = remove_vma(vma);
|
||||
remove_vma(vma);
|
||||
count++;
|
||||
cond_resched();
|
||||
}
|
||||
} while ((vma = mas_find(&mas, ULONG_MAX)) != NULL);
|
||||
|
||||
BUG_ON(count != mm->map_count);
|
||||
|
||||
trace_exit_mmap(mm);
|
||||
__mt_destroy(&mm->mm_mt);
|
||||
mm->mmap = NULL;
|
||||
mmap_write_unlock(mm);
|
||||
vm_unacct_memory(nr_accounted);
|
||||
}
|
||||
@ -3306,7 +3206,7 @@ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
vma->vm_pgoff = vma->vm_start >> PAGE_SHIFT;
|
||||
}
|
||||
|
||||
if (vma_link(mm, vma, prev)) {
|
||||
if (vma_link(mm, vma)) {
|
||||
vm_unacct_memory(charged);
|
||||
return -ENOMEM;
|
||||
}
|
||||
@ -3338,7 +3238,8 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
|
||||
faulted_in_anon_vma = false;
|
||||
}
|
||||
|
||||
if (range_has_overlap(mm, addr, addr + len, &prev))
|
||||
new_vma = find_vma_prev(mm, addr, &prev);
|
||||
if (new_vma && new_vma->vm_start < addr + len)
|
||||
return NULL; /* should never get here */
|
||||
|
||||
new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags,
|
||||
@ -3381,7 +3282,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
|
||||
get_file(new_vma->vm_file);
|
||||
if (new_vma->vm_ops && new_vma->vm_ops->open)
|
||||
new_vma->vm_ops->open(new_vma);
|
||||
if (vma_link(mm, new_vma, prev))
|
||||
if (vma_link(mm, new_vma))
|
||||
goto out_vma_link;
|
||||
*need_rmap_locks = false;
|
||||
}
|
||||
@ -3686,12 +3587,13 @@ int mm_take_all_locks(struct mm_struct *mm)
|
||||
{
|
||||
struct vm_area_struct *vma;
|
||||
struct anon_vma_chain *avc;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
|
||||
mmap_assert_write_locked(mm);
|
||||
|
||||
mutex_lock(&mm_all_locks_mutex);
|
||||
|
||||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
mas_for_each(&mas, vma, ULONG_MAX) {
|
||||
if (signal_pending(current))
|
||||
goto out_unlock;
|
||||
if (vma->vm_file && vma->vm_file->f_mapping &&
|
||||
@ -3699,7 +3601,8 @@ int mm_take_all_locks(struct mm_struct *mm)
|
||||
vm_lock_mapping(mm, vma->vm_file->f_mapping);
|
||||
}
|
||||
|
||||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
mas_set(&mas, 0);
|
||||
mas_for_each(&mas, vma, ULONG_MAX) {
|
||||
if (signal_pending(current))
|
||||
goto out_unlock;
|
||||
if (vma->vm_file && vma->vm_file->f_mapping &&
|
||||
@ -3707,7 +3610,8 @@ int mm_take_all_locks(struct mm_struct *mm)
|
||||
vm_lock_mapping(mm, vma->vm_file->f_mapping);
|
||||
}
|
||||
|
||||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
mas_set(&mas, 0);
|
||||
mas_for_each(&mas, vma, ULONG_MAX) {
|
||||
if (signal_pending(current))
|
||||
goto out_unlock;
|
||||
if (vma->anon_vma)
|
||||
@ -3766,11 +3670,12 @@ void mm_drop_all_locks(struct mm_struct *mm)
|
||||
{
|
||||
struct vm_area_struct *vma;
|
||||
struct anon_vma_chain *avc;
|
||||
MA_STATE(mas, &mm->mm_mt, 0, 0);
|
||||
|
||||
mmap_assert_write_locked(mm);
|
||||
BUG_ON(!mutex_is_locked(&mm_all_locks_mutex));
|
||||
|
||||
for (vma = mm->mmap; vma; vma = vma->vm_next) {
|
||||
mas_for_each(&mas, vma, ULONG_MAX) {
|
||||
if (vma->anon_vma)
|
||||
list_for_each_entry(avc, &vma->anon_vma_chain, same_vma)
|
||||
vm_unlock_anon_vma(avc->anon_vma);
|
||||
|
||||
@ -584,17 +584,12 @@ static void setup_vma_to_mm(struct vm_area_struct *vma, struct mm_struct *mm)
|
||||
static void mas_add_vma_to_mm(struct ma_state *mas, struct mm_struct *mm,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
struct vm_area_struct *prev;
|
||||
|
||||
BUG_ON(!vma->vm_region);
|
||||
|
||||
setup_vma_to_mm(vma, mm);
|
||||
|
||||
prev = mas_prev(mas, 0);
|
||||
mas_reset(mas);
|
||||
/* add the VMA to the tree */
|
||||
vma_mas_store(vma, mas);
|
||||
__vma_link_list(mm, vma, prev);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -647,7 +642,6 @@ static int delete_vma_from_mm(struct vm_area_struct *vma)
|
||||
|
||||
/* remove from the MM's tree and list */
|
||||
vma_mas_remove(vma, &mas);
|
||||
__vma_unlink_list(vma->vm_mm, vma);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
40
mm/util.c
40
mm/util.c
@ -272,46 +272,6 @@ void *memdup_user_nul(const void __user *src, size_t len)
|
||||
}
|
||||
EXPORT_SYMBOL(memdup_user_nul);
|
||||
|
||||
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||
struct vm_area_struct *prev)
|
||||
{
|
||||
struct vm_area_struct *next;
|
||||
|
||||
vma->vm_prev = prev;
|
||||
if (prev) {
|
||||
next = prev->vm_next;
|
||||
prev->vm_next = vma;
|
||||
} else {
|
||||
next = mm->mmap;
|
||||
mm->mmap = vma;
|
||||
}
|
||||
vma->vm_next = next;
|
||||
if (next)
|
||||
next->vm_prev = vma;
|
||||
else
|
||||
mm->highest_vm_end = vm_end_gap(vma);
|
||||
}
|
||||
|
||||
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma)
|
||||
{
|
||||
struct vm_area_struct *prev, *next;
|
||||
|
||||
next = vma->vm_next;
|
||||
prev = vma->vm_prev;
|
||||
if (prev)
|
||||
prev->vm_next = next;
|
||||
else
|
||||
mm->mmap = next;
|
||||
if (next) {
|
||||
next->vm_prev = prev;
|
||||
} else {
|
||||
if (prev)
|
||||
mm->highest_vm_end = vm_end_gap(prev);
|
||||
else
|
||||
mm->highest_vm_end = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Check if the vma is being used as a stack by this task */
|
||||
int vma_is_stack_for_current(struct vm_area_struct *vma)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user