From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: akpm@linux-foundation.org
Cc: aarcange@redhat.com, linux-mm@kvack.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH] thp: do not mark zero-page pmd write-protected explicitly
Date: Tue, 28 Oct 2014 16:44:32 +0200 [thread overview]
Message-ID: <1414507472-115086-1-git-send-email-kirill.shutemov@linux.intel.com> (raw)
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@linux.intel.com>
---
mm/huge_memory.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 74c78aa8bc2f..6939c9b4a1c7 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);
--
2.1.1
--
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reply other threads:[~2014-10-28 14:44 UTC|newest]
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