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

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Date:	Fri, 29 Aug 2008 13:04:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	jes@....com, 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

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Fri, 29 Aug 2008 09:14:44 -0700 (PDT)

> 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..

True, but we have to get there one step at a time.

BTW, sparc64 already wants a pointer here, so it's completely ready for
this:

void arch_send_call_function_ipi(cpumask_t mask)
{
	xcall_deliver((u64) &xcall_call_function, 0, 0, &mask);
}
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