linux-kernel - Re: Rgeression: 2.6.30-rc6-git3 build error

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Date:	Tue, 19 May 2009 10:52:38 -0700 (PDT)
From:	Martin Knoblauch <spamtrap@...bisoft.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matt Mackall <mpm@...enic.com>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Rgeression: 2.6.30-rc6-git3 build error - ICE from drivers/char/random.c


----- Original Message ----

> From: Linus Torvalds <torvalds@...ux-foundation.org>
> To: Martin Knoblauch <spamtrap@...bisoft.de>
> Cc: Matt Mackall <mpm@...enic.com>; Ingo Molnar <mingo@...e.hu>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
> Sent: Tuesday, May 19, 2009 5:09:40 PM
> Subject: Re: Rgeression: 2.6.30-rc6-git3 build error - ICE from drivers/char/random.c
> 
> 
> 
> On Tue, 19 May 2009, Martin Knoblauch wrote:
> > 
> >  With your patch, the problem still remains. Line 1685 is the end of the 
> patched routine now.
> 
> Ok, so can you do two other simple tests:
> 
> - just remove the  "+ (long)&ret" entirely.
> 
>    Now, usually gcc doesn't have issues with non-asm things, but that's an 
>    odd way of getting the current stack address by lookin gat the address 
>    of a variable that hasn't even been used, so maybe it triggers some 
>    untested codepath in gcc (and thus the bug).
> 

 Removing above fixes the ICE. It does so in both the original and the patched version. 

 Removing get_cycles() has no effect wrt. the ICE.

Cheers
Martin

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