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| author | Jovi Zhang <bookjovi@gmail.com> | 2012-08-22 10:34:08 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2012-08-27 16:10:21 +0200 |
| commit | af89fa3986b9d034a286544ab1ed95096496a2f9 (patch) | |
| tree | 5fa5bc0a8bcf79625bc36488663c9092fcacbe0c /arch/mips/mm/gup.c | |
| parent | 2bd4082776ff17a0d0d565852afb422931c2f6f2 (diff) | |
| download | linux-0-day-af89fa3986b9d034a286544ab1ed95096496a2f9.tar.gz linux-0-day-af89fa3986b9d034a286544ab1ed95096496a2f9.tar.xz | |
MIPS: mm: Add compound tail page _mapcount when mapped
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>
Diffstat (limited to 'arch/mips/mm/gup.c')
| -rw-r--r-- | arch/mips/mm/gup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c index 33aadbcf170bb..dcfd573871c14 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++; |