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4eb0716e86
On systems without CONTIG_ALLOC activated but that support gigantic pages, boottime reserved gigantic pages can not be freed at all. This patch simply enables the possibility to hand back those pages to memory allocator. Link: http://lkml.kernel.org/r/20190327063626.18421-5-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: David S. Miller <davem@davemloft.net> [sparc] Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Andy Lutomirsky <luto@kernel.org> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rich Felker <dalias@libc.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will.deacon@arm.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
125 lines
2.8 KiB
C
125 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2008
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#ifndef _ASM_S390_HUGETLB_H
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#define _ASM_S390_HUGETLB_H
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#define is_hugepage_only_range(mm, addr, len) 0
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#define hugetlb_free_pgd_range free_pgd_range
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#define hugepages_supported() (MACHINE_HAS_EDAT1)
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte);
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pte_t huge_ptep_get(pte_t *ptep);
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep);
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/*
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* If the arch doesn't supply something else, assume that hugepage
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* size aligned regions are ok without further preparation.
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*/
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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if (len & ~HPAGE_MASK)
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return -EINVAL;
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if (addr & ~HPAGE_MASK)
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return -EINVAL;
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return 0;
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}
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static inline void arch_clear_hugepage_flags(struct page *page)
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{
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clear_bit(PG_arch_1, &page->flags);
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}
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static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, unsigned long sz)
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{
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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pte_val(*ptep) = _REGION3_ENTRY_EMPTY;
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else
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pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY;
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}
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static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
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}
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static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t pte, int dirty)
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{
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int changed = !pte_same(huge_ptep_get(ptep), pte);
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if (changed) {
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huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
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set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
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}
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return changed;
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}
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
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set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
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}
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static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
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{
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return mk_pte(page, pgprot);
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}
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static inline int huge_pte_none(pte_t pte)
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{
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return pte_none(pte);
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}
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static inline int huge_pte_write(pte_t pte)
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{
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return pte_write(pte);
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}
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static inline int huge_pte_dirty(pte_t pte)
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{
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return pte_dirty(pte);
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}
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static inline pte_t huge_pte_mkwrite(pte_t pte)
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{
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return pte_mkwrite(pte);
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}
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static inline pte_t huge_pte_mkdirty(pte_t pte)
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{
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return pte_mkdirty(pte);
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}
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static inline pte_t huge_pte_wrprotect(pte_t pte)
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{
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return pte_wrprotect(pte);
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}
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static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
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{
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return pte_modify(pte, newprot);
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}
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static inline bool gigantic_page_runtime_supported(void)
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{
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return true;
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}
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#endif /* _ASM_S390_HUGETLB_H */
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