Messages in this thread Patch in this message | | | Date | Wed, 22 Aug 2012 11:02:34 +0800 | Subject | [PATCH] MIPS/mm: add compound tail page _mapcount when mapped | From | Jovi Zhang <> |
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From 3dc19ea2b535719d0b4177f17bbbff9cbf257b23 Mon Sep 17 00:00:00 2001 From: Jovi Zhang <bookjovi@gmail.com> Date: Wed, 22 Aug 2012 10:34:08 +0800 Subject: [PATCH] MIPS/mm: add compound tail page _mapcount when mapped
see commit b6999b191 which target for x86 mm/gup, let it align with mips architecture.
Quote from commit b6999b191: "If compound pages are used and the page is a tail page, gup_huge_pmd() increases _mapcount to record tail page are mapped while gup_huge_pud does not do that."
Signed-off-by: Jovi Zhang <boojovi@gmail.com> Cc: Youquan Song <youquan.song@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: <stable@vger.kernel.org> --- arch/mips/mm/gup.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c index 33aadbc..dcfd573 100644 --- a/arch/mips/mm/gup.c +++ b/arch/mips/mm/gup.c @@ -152,6 +152,8 @@ static int gup_huge_pud(pud_t pud, unsigned long addr, unsigned long end, do { VM_BUG_ON(compound_head(page) != head); pages[*nr] = page; + if (PageTail(page)) + get_huge_page_tail(page); (*nr)++; page++; refs++; -- 1.7.9.7
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