From 870fefcd916e9766ff3ac689aa87e9f3abbe9381 Mon Sep 17 00:00:00 2001 From: Jovi Zhang Date: Wed, 22 Aug 2012 10:34:08 +0800 Subject: [PATCH] MIPS: mm: Add compound tail page _mapcount when mapped commit af89fa3986b9d034a286544ab1ed95096496a2f9 upstream. See commit b6999b191 which did the same modification for x86's mm/gup, 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." [ralf@linux-mips.org: fixed rejects caused by the original patch getting linewrapped.] Signed-off-by: Jovi Zhang Cc: Youquan Song Cc: Andi Kleen Patchwork: https://patchwork.linux-mips.org/patch/4291/ Signed-off-by: Ralf Baechle Signed-off-by: Greg Kroah-Hartman --- 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++; -- 2.7.4