linux-kernel - Re: [PATCH 0/3] [GIT PULL][v2.6.38] tracing: fix unaligned event arrays

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Message-ID: <20110126205903.GC14361@elte.hu>
Date:	Wed, 26 Jan 2011 21:59:03 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Miller <davem@...emloft.net>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 0/3] [GIT PULL][v2.6.38] tracing: fix unaligned event
 arrays


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 2011-01-26 at 07:47 +0100, Ingo Molnar wrote:
> 
> > > Mathieu Desnoyers (3):
> > >       Introduce __u64_aligned and U64_ALIGN() for structure alignment in custom sections
> > >       tracing: Fix sparc64 alignment crash with __u64_aligned/U64_ALIGN()
> > >       tracepoints: Use __u64_aligned/U64_ALIGN()
> > > 
> 
> > Pulled, thanks a lot Steve!
> > 
> > 	Ingo
> 
> 
> Hi Ingo,
> 
> We (well Peter really) just discovered that this can cause alignment
> issues with gcc 4.4.4 and 4.4.5 (I unfortunately only tested it with gcc
> 4.5.1). We are currently looking into fixing it.
> 
> Letting you know so that you don't push this off to Linus ;-)

Well, i found and reported that 'perf stat -e irq:irq_handler_entry -a sleep 1' 
crash to Peter (i first thought it's due to his patch) so yes i know about it :-)

Thanks,

	Ingo
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