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sparc64: update pmdp_invalidate() to return old pmd value

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It's required to avoid losing dirty and accessed bits.

[akpm@linux-foundation.org: add a `do' to the do-while loop]
Link: http://lkml.kernel.org/r/20171213105756.69879-9-kirill.shutemov@linux.intel.com
Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nitin Gupta 2018-01-31 16:18:09 -08:00 committed by Linus Torvalds
parent 9c4563f11f
commit a8e654f01c
2 changed files with 19 additions and 6 deletions
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2
arch/sparc/include/asm/pgtable_64.h
View File

@ -1010,7 +1010,7 @@ void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
pmd_t *pmd); pmd_t *pmd);
#define __HAVE_ARCH_PMDP_INVALIDATE #define __HAVE_ARCH_PMDP_INVALIDATE
extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp); pmd_t *pmdp);
#define __HAVE_ARCH_PGTABLE_DEPOSIT #define __HAVE_ARCH_PGTABLE_DEPOSIT

23
arch/sparc/mm/tlb.c
View File

@ -219,17 +219,28 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
} }
} }
static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp, pmd_t pmd)
{
pmd_t old;
do {
old = *pmdp;
} while (cmpxchg64(&pmdp->pmd, old.pmd, pmd.pmd) != old.pmd);
return old;
}
/* /*
* This routine is only called when splitting a THP * This routine is only called when splitting a THP
*/ */
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp) pmd_t *pmdp)
{ {
pmd_t entry = *pmdp; pmd_t old, entry;
pmd_val(entry) &= ~_PAGE_VALID; entry = __pmd(pmd_val(*pmdp) & ~_PAGE_VALID);
old = pmdp_establish(vma, address, pmdp, entry);
set_pmd_at(vma->vm_mm, address, pmdp, entry);
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
/* /*
@ -240,6 +251,8 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
if ((pmd_val(entry) & _PAGE_PMD_HUGE) && if ((pmd_val(entry) & _PAGE_PMD_HUGE) &&
!is_huge_zero_page(pmd_page(entry))) !is_huge_zero_page(pmd_page(entry)))
(vma->vm_mm)->context.thp_pte_count--; (vma->vm_mm)->context.thp_pte_count--;
return old;
} }
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,