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Date: Thu, 15 Nov 2012 21:26:55 +0200 From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> To: Andrew Morton <akpm@...ux-foundation.org>, Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org Cc: Andi Kleen <ak@...ux.intel.com>, "H. Peter Anvin" <hpa@...ux.intel.com>, linux-kernel@...r.kernel.org, "Kirill A. Shutemov" <kirill@...temov.name>, David Rientjes <rientjes@...gle.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Subject: [PATCH v6 05/12] thp: change_huge_pmd(): keep huge zero page write-protected From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> We want to get page fault on write attempt to huge zero page, so let's keep it write-protected. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> --- mm/huge_memory.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index f5589c0..42607a1 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1245,6 +1245,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, pmd_t entry; entry = pmdp_get_and_clear(mm, addr, pmd); entry = pmd_modify(entry, newprot); + if (is_huge_zero_pmd(entry)) + entry = pmd_wrprotect(entry); set_pmd_at(mm, addr, pmd, entry); spin_unlock(&vma->vm_mm->page_table_lock); ret = 1; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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