3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jovi Zhang <bookj...@gmail.com>
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."
[r...@linux-mips.org: fixed rejects caused by the original patch getting
linewrapped.]
Signed-off-by: Jovi Zhang <booj...@gmail.com>
Cc: Youquan Song <youquan.s...@intel.com>
Cc: Andi Kleen <a...@firstfloor.org>
Patchwork: https://patchwork.linux-mips.org/patch/4291/
Signed-off-by: Ralf Baechle <r...@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/mips/mm/gup.c | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/mips/mm/gup.c
+++ b/arch/mips/mm/gup.c
@@ -152,6 +152,8 @@ static int gup_huge_pud(pud_t pud, unsig
do {
VM_BUG_ON(compound_head(page) != head);
pages[*nr] = page;
+ if (PageTail(page))
+ get_huge_page_tail(page);
(*nr)++;
page++;
refs++;
--
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