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

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Date:	Tue, 02 Sep 2008 16:27:14 +0200
From:	Jes Sorensen <jes@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	David Miller <davem@...emloft.net>, travis@....com, mingo@...e.hu,
	Alan.Brunelle@...com, tglx@...utronix.de, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	akpm@...ux-foundation.org, arjan@...ux.intel.com,
	rusty@...tcorp.com.au
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

Linus Torvalds wrote:
> 
> On Fri, 29 Aug 2008, Jes Sorensen wrote:
>> I have only tested this on ia64, but it boots, so it's obviously
>> perfect<tm> :-)
> 
> Well, it probably boots because it doesn't really seem to _change_ much of 
> anything.
> 
> Things like this:
> 
> 	-static inline void arch_send_call_function_ipi(cpumask_t mask)
> 	+static inline void arch_send_call_function_ipi(cpumask_t *mask)
> 	 {
> 	-       smp_ops.send_call_func_ipi(mask);
> 	+       smp_ops.send_call_func_ipi(*mask);
> 	 }
> 
> will still do that stack allocation at the time of the call. You'd have to 
> pass the thing all the way down as a pointer..

Linus,

Ok, so here's a version which tries to do the right thing on x86 as
well. Build tested on x86_64, but don't have an easy way to test it
right now. It's booting on ia64.

Cheers,
Jes


View attachment "0040-smp-call-cpumask.patch" of type "text/plain" (26201 bytes)