linux-kernel - Re: Random scheduler/unaligned accesses crashes with perf lock events on sparc 64

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Message-ID: <1270558655.1595.265.camel@laptop>
Date:	Tue, 06 Apr 2010 14:57:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, acme@...hat.com,
	paulus@...ba.org
Subject: Re: Random scheduler/unaligned accesses crashes with perf lock
 events on sparc 64

On Tue, 2010-04-06 at 14:54 +0200, Mike Galbraith wrote:
> > ARGH.. yes
> > 
> > Also, I guess that should live in perf_output_lock/unlock() not in
> > perf_event_task_output().
> > 
> > Egads, how to fix that
> 
> Damn, so deadlock fix isn't a fix.  No idea. 

well it is,. but it breaks sparc..

I'm currently compile testing a bunch to fix all that up by doing what
davem suggested: local_irq_save_nmi()/local_irq_restore_nmi().



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