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authorKirill A. Shutemov <kirill@shutemov.name>2014-12-10 15:44:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:08 -0800
commite544a4e74e02108035de69f97fde7bdf19dba978 (patch)
treefb19a9556d16189673cd0d416a57cbf4026f3405 /mm/huge_memory.c
parentb047501cd9f11d5e1d54ea0f90e2b10754021a0e (diff)
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thp: do not mark zero-page pmd write-protected explicitly
Zero pages can be used only in anonymous mappings, which never have writable vma->vm_page_prot: see protection_map in mm/mmap.c and __PX1X definitions. Let's drop redundant pmd_wrprotect() in set_huge_zero_page(). Signed-off-by: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index de984159cf0b..5b2c6875fc38 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -784,7 +784,6 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
if (!pmd_none(*pmd))
return false;
entry = mk_pmd(zero_page, vma->vm_page_prot);
- entry = pmd_wrprotect(entry);
entry = pmd_mkhuge(entry);
pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, haddr, pmd, entry);