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| author | Kirill A. Shutemov <kirill@shutemov.name> | 2014-12-10 15:44:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:08 -0800 |
| commit | e544a4e74e02108035de69f97fde7bdf19dba978 (patch) | |
| tree | fb19a9556d16189673cd0d416a57cbf4026f3405 /mm/huge_memory.c | |
| parent | b047501cd9f11d5e1d54ea0f90e2b10754021a0e (diff) | |
| download | linux-e544a4e74e02108035de69f97fde7bdf19dba978.tar.gz linux-e544a4e74e02108035de69f97fde7bdf19dba978.tar.bz2 linux-e544a4e74e02108035de69f97fde7bdf19dba978.zip | |
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.c | 1 |
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); |