Re: [PATCH 10/18] perfmon2 patch for review: PMU contextswitch support

From: Andrew Morton
Date: Wed Aug 23 2006 - 19:04:36 EST

On Wed, 23 Aug 2006 01:06:01 -0700
Stephane Eranian <eranian@xxxxxxxxxxxxxxxxx> wrote:

> +#define PFM_LAST_CPU(ctx, act) \
> + ((ctx)->last_cpu == smp_processor_id() && (ctx)->last_act == act)

Hiding this in a macro rather invites mistakes. Has all this code been
thoroughly tested with CONFIG_DEBUG_PREEMPT, to detect use of
smp_processor_id() in preemptible code?
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