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

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Message-ID: <18612.60878.887716.452936@drongo.ozlabs.ibm.com>
Date:	Wed, 27 Aug 2008 16:01:50 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	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

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:

#define THREAD_SIZE (2*PAGE_SIZE)
#define alloc_task_struct() ((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
#define free_task_struct(p) free_pages((unsigned long) (p), 1)

Paul.
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