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

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Date:	Tue, 08 Dec 2015 08:02:15 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Denis Kirjanov <kda@...ux-powerpc.org>
Cc:	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 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).

Cheers,
Ben.

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