linux-kernel - Re: [PATCH 2/2] powerpc: tracing: don't trace hcalls on offline CPUs

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Message-ID: <20151207163343.0ea2f1bb@gandalf.local.home>
Date:	Mon, 7 Dec 2015 16:33:43 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Denis Kirjanov <kda@...ux-powerpc.org>,
	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] powerpc: tracing: don't trace hcalls on offline
 CPUs

On Tue, 08 Dec 2015 08:02:15 +1100
Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Mon, 2015-12-07 at 15:52 -0500, Steven Rostedt wrote:
> > > +     TP_CONDITION(cpu_online(smp_processor_id())),
> > > +  
> 
> This should probably be some kind of __raw version though, hcalls can
> be called in contexts where the debug stuff in smp_processor_id() isn't
> safe (or preempt enabled).
> 

OK, then that needs to be updated.

-- Steve
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