linux-kernel - Re: [PATCH] ftrace: Fix improper usage of __trace

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Date:   Thu, 25 Aug 2022 10:41:36 -0300
From:   "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Anand Je Saipureddy <s.anandje1@...il.com>,
        Clark Williams <williams@...hat.com>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        cminyard@...sta.com, psiddaiah@...sta.com
Subject: Re: [PATCH] ftrace: Fix improper usage of __trace_stack() function.

On Wed, Aug 03, 2022 at 09:50:17AM +0200, Sebastian Andrzej Siewior wrote:
> On 2022-07-23 12:19:43 [+0530], Anand Je Saipureddy wrote:
> > In kernel/trace/trace_events_trigger.c --> stacktrace_trigger() -->
> > __trace_stack() is not defined as per the function definition.
> > 
> > With commit edbaaa13a660
> > ("tracing: Merge irqflags + preemt counter, add RT bits")
> > the irqflags(flags) and preemption counter(preempt_count()) are
> > now should be evaluated early by tracing_gen_ctx().
> > 
> > This patch replaces the irqflags and preemption counter
> > with tracing_gen_ctx().
> > 
> > Fixes: 5e8446e3820c ("tracing: Dump stacktrace trigger to the corresponding instance")
> > Signed-off-by: Anand Je Saipureddy <s.anandje1@...il.com>
> > Reviewed-by: Corey Minyard <cminyard@...sta.com>
> 
> Please use [PATCH RT v5.10] in the future.
> Luis, could you please pick it up?

Added to the list.

And thank you for spotting this change, I missed that in my earlier sweep.

Luis
 
> > ---
> >  kernel/trace/trace_events_trigger.c | 8 +++-----
> >  1 file changed, 3 insertions(+), 5 deletions(-)
> > 
> > diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> > index 75fef9fcfd0f..3c6229f16e81 100644
> > --- a/kernel/trace/trace_events_trigger.c
> > +++ b/kernel/trace/trace_events_trigger.c
> > @@ -1220,12 +1220,10 @@ stacktrace_trigger(struct event_trigger_data *data, void *rec,
> >  		   struct ring_buffer_event *event)
> >  {
> >  	struct trace_event_file *file = data->private_data;
> > -	unsigned long flags;
> >  
> > -	if (file) {
> > -		local_save_flags(flags);
> > -		__trace_stack(file->tr, STACK_SKIP, preempt_count());
> > -	} else
> > +	if (file)
> > +		__trace_stack(file->tr, tracing_gen_ctx(), STACK_SKIP);
> > +	else
> >  		trace_dump_stack(STACK_SKIP);
> >  }
> >  
> 
> Sebastian
> 
---end quoted text---