linux-kernel - Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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Message-ID: <20080415212833.GA6180@elte.hu>
Date:	Tue, 15 Apr 2008 23:28:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai.Lu@....com,
	apw@...dowen.org, travis@....com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [bug] SLUB + mm/slab.c boot crash in -rc9


* Christoph Lameter <clameter@....com> wrote:

> On Tue, 15 Apr 2008, Ingo Molnar wrote:
> 
> > > static DEFINE_PER_CPU(char, dummy)[10000];
> > 
> > what's the guarantee that it's at the end of the section? I'd like 
> > to pad the per cpu areas at their end. (doubling their size is a 
> > good way to achieve that)
> 
> No guarantee. Its up to the linker. Sorry. We could add a new 
> percpu.last section but that requires a number of changes to linking.

ah. Then the patch below should do the trick, right?

	Ingo

------------->
Subject: larger: percpu
From: Ingo Molnar <mingo@...e.hu>
Date: Tue Apr 15 23:13:18 CEST 2008

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/vmlinux_32.lds.S |    1 +
 1 file changed, 1 insertion(+)

Index: linux/arch/x86/kernel/vmlinux_32.lds.S
===================================================================
--- linux.orig/arch/x86/kernel/vmlinux_32.lds.S
+++ linux/arch/x86/kernel/vmlinux_32.lds.S
@@ -186,6 +186,7 @@ SECTIONS
 	__per_cpu_start = .;
 	*(.data.percpu)
 	*(.data.percpu.shared_aligned)
+	. = . + 65536;
 	__per_cpu_end = .;
   }
   . = ALIGN(PAGE_SIZE);
--
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