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This change converts the existing mmap_sem rwsem calls to use the new mmap locking API instead. The change is generated using coccinelle with the following rule: // spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir . @@ expression mm; @@ ( -init_rwsem +mmap_init_lock | -down_write +mmap_write_lock | -down_write_killable +mmap_write_lock_killable | -down_write_trylock +mmap_write_trylock | -up_write +mmap_write_unlock | -downgrade_write +mmap_write_downgrade | -down_read +mmap_read_lock | -down_read_killable +mmap_read_lock_killable | -down_read_trylock +mmap_read_trylock | -up_read +mmap_read_unlock ) -(&mm->mmap_sem) +(mm) Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Liam Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ying Han <yinghan@google.com> Link: http://lkml.kernel.org/r/20200520052908.204642-5-walken@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/pagewalk.h>
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#include <linux/ptdump.h>
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#include <linux/kasan.h>
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#ifdef CONFIG_KASAN
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/*
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* This is an optimization for KASAN=y case. Since all kasan page tables
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* eventually point to the kasan_early_shadow_page we could call note_page()
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* right away without walking through lower level page tables. This saves
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* us dozens of seconds (minutes for 5-level config) while checking for
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* W+X mapping or reading kernel_page_tables debugfs file.
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*/
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static inline int note_kasan_page_table(struct mm_walk *walk,
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unsigned long addr)
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{
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struct ptdump_state *st = walk->private;
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st->note_page(st, addr, 4, pte_val(kasan_early_shadow_pte[0]));
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walk->action = ACTION_CONTINUE;
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return 0;
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}
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#endif
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static int ptdump_pgd_entry(pgd_t *pgd, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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pgd_t val = READ_ONCE(*pgd);
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#if CONFIG_PGTABLE_LEVELS > 4 && defined(CONFIG_KASAN)
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if (pgd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_p4d)))
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return note_kasan_page_table(walk, addr);
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#endif
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if (st->effective_prot)
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st->effective_prot(st, 0, pgd_val(val));
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if (pgd_leaf(val))
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st->note_page(st, addr, 0, pgd_val(val));
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return 0;
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}
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static int ptdump_p4d_entry(p4d_t *p4d, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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p4d_t val = READ_ONCE(*p4d);
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#if CONFIG_PGTABLE_LEVELS > 3 && defined(CONFIG_KASAN)
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if (p4d_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pud)))
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return note_kasan_page_table(walk, addr);
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#endif
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if (st->effective_prot)
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st->effective_prot(st, 1, p4d_val(val));
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if (p4d_leaf(val))
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st->note_page(st, addr, 1, p4d_val(val));
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return 0;
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}
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static int ptdump_pud_entry(pud_t *pud, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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pud_t val = READ_ONCE(*pud);
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#if CONFIG_PGTABLE_LEVELS > 2 && defined(CONFIG_KASAN)
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if (pud_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pmd)))
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return note_kasan_page_table(walk, addr);
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#endif
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if (st->effective_prot)
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st->effective_prot(st, 2, pud_val(val));
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if (pud_leaf(val))
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st->note_page(st, addr, 2, pud_val(val));
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return 0;
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}
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static int ptdump_pmd_entry(pmd_t *pmd, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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pmd_t val = READ_ONCE(*pmd);
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#if defined(CONFIG_KASAN)
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if (pmd_page(val) == virt_to_page(lm_alias(kasan_early_shadow_pte)))
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return note_kasan_page_table(walk, addr);
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#endif
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if (st->effective_prot)
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st->effective_prot(st, 3, pmd_val(val));
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if (pmd_leaf(val))
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st->note_page(st, addr, 3, pmd_val(val));
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return 0;
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}
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static int ptdump_pte_entry(pte_t *pte, unsigned long addr,
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unsigned long next, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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pte_t val = READ_ONCE(*pte);
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if (st->effective_prot)
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st->effective_prot(st, 4, pte_val(val));
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st->note_page(st, addr, 4, pte_val(val));
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return 0;
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}
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static int ptdump_hole(unsigned long addr, unsigned long next,
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int depth, struct mm_walk *walk)
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{
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struct ptdump_state *st = walk->private;
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st->note_page(st, addr, depth, 0);
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return 0;
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}
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static const struct mm_walk_ops ptdump_ops = {
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.pgd_entry = ptdump_pgd_entry,
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.p4d_entry = ptdump_p4d_entry,
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.pud_entry = ptdump_pud_entry,
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.pmd_entry = ptdump_pmd_entry,
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.pte_entry = ptdump_pte_entry,
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.pte_hole = ptdump_hole,
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};
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void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd)
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{
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const struct ptdump_range *range = st->range;
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mmap_read_lock(mm);
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while (range->start != range->end) {
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walk_page_range_novma(mm, range->start, range->end,
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&ptdump_ops, pgd, st);
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range++;
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}
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mmap_read_unlock(mm);
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/* Flush out the last page */
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st->note_page(st, 0, -1, 0);
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}
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