Commit af89fa39 authored Aug 22, 2012 by Jovi Zhang Committed by Ralf Baechle Aug 27, 2012

MIPS: mm: Add compound tail page _mapcount when mapped



See commit b6999b19 which did the same modification for x86's mm/gup,

Quote from commit b6999b19:
    "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>

parent 2bd40827

arch/mips/mm/gup.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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++;

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