linux-kernel - Re: [PATCH] Fix print out of function which called WARN

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Date:	Sun, 17 May 2009 15:54:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Andi Kleen <ak@...ux.intel.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jakub Jelinek <jakub@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Fix print out of function which called WARN_ON()

On Sun, 17 May 2009, Hugh Dickins wrote:
> 
> No, not sure at all, that was just a conclusion I jumped to.
> Though I think I was seeing it on x86-32 too.

Ok, the 32-bit calling convention doesn't do any of that, even though we 
compile the kernel with -mregparm=3. Any function with varargs arguments 
gets all arguments passed on the stack, and we just pass the frame pointer 
along, so there's no extra buffers.

So if you saw it on x86-32, then I think the only empty hole is indeed 
due to that 'char function[KSYM_SYMBOL_LEN]' (and whatever stack alignment 
code gcc does). And yes, it should be much better now.

			Linus
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