linux-kernel - Re: [PATCH 1/2] tracing: Fix synth event test to avoid using smp_processor

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Message-ID: <20200220174801.2b793ae1@gandalf.local.home>
Date:   Thu, 20 Feb 2020 17:48:01 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Tom Zanussi <zanussi@...nel.org>, artem.bityutskiy@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH 1/2] tracing: Fix synth event test to avoid using
 smp_processor_id()

On Mon, 17 Feb 2020 18:52:29 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Since smp_processor_id() requires irq-disabled or preempt-disabled,
> synth event generation test module made some warnings. To prevent
> that, use get_cpu()/put_cpu() instead of smp_processor_id().
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  kernel/trace/synth_event_gen_test.c |   23 +++++++++++++++++------
>  1 file changed, 17 insertions(+), 6 deletions(-)
>

I just noticed this patch, after applying my version that just uses the
raw_smp_processor_id(). We don't really care what CPU it is do we?

I didn't want a test to muck with preemption disabling and all that fun.

-- Steve