Re: [PATCH 1/2] tracing: Fix synth event test to avoid using smp_processor_id()

[Tom Zanussi]

Hi Steve,

On Thu, 2020-02-20 at 17:48 -0500, Steven Rostedt wrote:
> On Mon, 17 Feb 2020 18:52:29 +0900
> Masami Hiramatsu <mhiramat@xxxxxxxxxx> 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@xxxxxxxxxx>
> > ---
> >  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.
> 

Right, we don't really care, it's just to test the trace API - for this
it could even be a constant.  I just happened to pick that as an
example, and wasn't expecting unrelated complications.

Tom 

> -- Steve