linux-kernel - Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Date:	Wed, 27 Aug 2008 03:58:58 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Parag Warudkar <parag.lkml@...il.com>,
	Adrian Bunk <bunk@...sta.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-embedded@...r.kernel.org
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

Paul Mackerras wrote:
> Linus Torvalds writes:
> 
>> 4kB used to be the _only_ choice. And no, there weren't even irq stacks. 
>> So that 4kB was not just the whole kernel call-chain, it was also all the 
>> irq nesting above it.
> 
> I think your memory is failing you.  In 2.4 and earlier, the kernel
> stack was 8kB minus the size of the task_struct, which sat at the
> start of the 8kB.  For instance, from include/asm-i386/processor.h for
> 2.4.29:

but was shared with interrupts; so out of the 6Kb left, you had still really only 4Kb for user context stack

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