linux-kernel - Re: [patch 00/50] 2.6.25.6 -stable review

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Date:	Sat, 7 Jun 2008 04:49:22 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Chris Wright <chrisw@...s-sol.org>
cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/50] 2.6.25.6 -stable review

On Fri, 6 Jun 2008, Chris Wright wrote:
> This is the start of the stable review cycle for the 2.6.25.6 release.
> There are 50 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let us know.  If anyone is a maintainer of the proper subsystem, and
> wants to add a Signed-off-by: line to the patch, please respond with it.

Please add 2.6.26-rc5's 2884f110d5409714f3a04eeb6d2ecd77da66b242
into 2.6.25.6: it's actually not a serious problem, but it does
look as if it's a serious problem, so we should stamp it out.

Thanks,
Hugh

x86: fix bad pmd ffff810000207xxx(9090909090909090)

OGAWA Hirofumi and Fede have reported rare pmd_ERROR messages:
mm/memory.c:127: bad pmd ffff810000207xxx(9090909090909090).

Initialization's cleanup_highmap was leaving alignment filler
behind in the pmd for MODULES_VADDR: when vmalloc's guard page
would occupy a new page table, it's not allocated, and then
module unload's vfree hits the bad 9090 pmd entry left over.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 32ba13b..998a06e 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -206,7 +206,7 @@ void __init cleanup_highmap(void)
 	pmd_t *last_pmd = pmd + PTRS_PER_PMD;
 
 	for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
-		if (!pmd_present(*pmd))
+		if (pmd_none(*pmd))
 			continue;
 		if (vaddr < (unsigned long) _text || vaddr > end)
 			set_pmd(pmd, __pmd(0));

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