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thp: do not mark zero-page pmd write-protected explicitly

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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>
This commit is contained in:
Kirill A. Shutemov 2014-12-10 15:44:22 -08:00 committed by Linus Torvalds
parent b047501cd9
commit e544a4e74e
1 changed files with 0 additions and 1 deletions
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mm/huge_memory.c
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@ -784,7 +784,6 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
if (!pmd_none(*pmd)) if (!pmd_none(*pmd))
return false; return false;
entry = mk_pmd(zero_page, vma->vm_page_prot); entry = mk_pmd(zero_page, vma->vm_page_prot);
entry = pmd_wrprotect(entry);
entry = pmd_mkhuge(entry); entry = pmd_mkhuge(entry);
pgtable_trans_huge_deposit(mm, pmd, pgtable); pgtable_trans_huge_deposit(mm, pmd, pgtable);
set_pmd_at(mm, haddr, pmd, entry); set_pmd_at(mm, haddr, pmd, entry);