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MIPS: mm: Add compound tail page _mapcount when mapped

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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 <boojovi@gmail.com>
Cc: Youquan Song <youquan.song@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: <stable@vger.kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/4291/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jovi Zhang 2012-08-22 10:34:08 +08:00 committed by Ralf Baechle
parent 2bd4082776
commit af89fa3986
1 changed files with 2 additions and 0 deletions
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2
arch/mips/mm/gup.c
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@ -152,6 +152,8 @@ static int gup_huge_pud(pud_t pud, unsigned long addr, unsigned long end,
do { do {
VM_BUG_ON(compound_head(page) != head); VM_BUG_ON(compound_head(page) != head);
pages[*nr] = page; pages[*nr] = page;
if (PageTail(page))
get_huge_page_tail(page);
(*nr)++; (*nr)++;
page++; page++;
refs++; refs++;