linux-kernel - [PATCH] MIPS/mm: add compound tail page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Aug 2012 11:02:34 +0800
From:	Jovi Zhang <bookjovi@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-mips@...ux-mips.org, Youquan Song <youquan.song@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: [PATCH] MIPS/mm: add compound tail page _mapcount when mapped

>From 3dc19ea2b535719d0b4177f17bbbff9cbf257b23 Mon Sep 17 00:00:00 2001
From: Jovi Zhang <bookjovi@...il.com>
Date: Wed, 22 Aug 2012 10:34:08 +0800
Subject: [PATCH] MIPS/mm: add compound tail page _mapcount when mapped

see commit b6999b191 which target for x86 mm/gup, let it align with
mips architecture.

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."

Signed-off-by: Jovi Zhang <boojovi@...il.com>
Cc: Youquan Song <youquan.song@...el.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: <stable@...r.kernel.org>
---
 arch/mips/mm/gup.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/mm/gup.c b/arch/mips/mm/gup.c
index 33aadbc..dcfd573 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++;
-- 
1.7.9.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/