linux-kernel - Re: [PATCH] sched/cpuacct: Check for NULL when using task_pt

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Message-ID: <1460545318.24090.1.camel@ellerman.id.au>
Date:	Wed, 13 Apr 2016 21:01:58 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Ingo Molnar <mingo@...nel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Anton Blanchard <anton@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
	efault@....de, htejun@...il.com, linux-kernel@...r.kernel.org,
	tj@...nel.org, torvalds@...ux-foundation.org,
	zhaolei@...fujitsu.com, yangds.fnst@...fujitsu.com, hpa@...or.com,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] sched/cpuacct: Check for NULL when using task_pt_regs()

On Wed, 2016-04-13 at 09:43 +0200, Ingo Molnar wrote:
> * Srikar Dronamraju <srikar@...ux.vnet.ibm.com> wrote:
> 
> > * Anton Blanchard <anton@...ba.org> [2016-04-06 21:59:50]:
> > 
> > > Looks good, and the patch below does fix the oops for me.
> > > 
> > > Anton
> > > --
> > > 
> > > task_pt_regs() can return NULL for kernel threads, so add a check.
> > > This fixes an oops at boot on ppc64.
> > > 
> > > Signed-off-by: Anton Blanchard <anton@...ba.org>
> > 
> > Works for me too.
> > 
> > Reported-and-Tested-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> 
> Could someone please re-send the fix, because it has not reached me nor lkml.

It did hit LKML:

http://lkml.kernel.org/r/20160406215950.04bc3f0b@kryten

But that did have some verbiage at the top.

Anton's also resent it directly To you.

cheers