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authorNitin Gupta <nitin.m.gupta@oracle.com>2018-01-31 16:18:09 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:38 -0800
commita8e654f01cb725d0bfd741ebca1bf4c9337969cc (patch)
tree7a4ff82baf27cdd3489fd66c31de80592d64add9 /arch/sparc/mm
parents390/mm: modify pmdp_invalidate to return old value. (diff)
downloadlinux-dev-a8e654f01cb725d0bfd741ebca1bf4c9337969cc.tar.xz
linux-dev-a8e654f01cb725d0bfd741ebca1bf4c9337969cc.zip
sparc64: update pmdp_invalidate() to return old pmd value
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>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/tlb.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
index 4ae86bc0d35c..847ddffbf38a 100644
--- a/arch/sparc/mm/tlb.c
+++ b/arch/sparc/mm/tlb.c
@@ -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
*/
-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 entry = *pmdp;
-
- pmd_val(entry) &= ~_PAGE_VALID;
+ pmd_t old, entry;
- set_pmd_at(vma->vm_mm, address, pmdp, entry);
+ entry = __pmd(pmd_val(*pmdp) & ~_PAGE_VALID);
+ old = pmdp_establish(vma, address, pmdp, entry);
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) &&
!is_huge_zero_page(pmd_page(entry)))
(vma->vm_mm)->context.thp_pte_count--;
+
+ return old;
}
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,