diff options
| author | Jovi Zhang <bookjovi@gmail.com> | 2012-08-22 10:34:08 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-02 10:30:09 -0700 |
| commit | 870fefcd916e9766ff3ac689aa87e9f3abbe9381 (patch) | |
| tree | 51ff1eb80eecc8be6c8f4e21b9573f30f9e7aad6 | |
| parent | 0ed92b21f3807633c70f7565f92b034ef8bf4b1c (diff) | |
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 <boojovi@gmail.com>
Cc: Youquan Song <youquan.song@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Patchwork: https://patchwork.linux-mips.org/patch/4291/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 33aadbcf170b..dcfd573871c1 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++; |