linux-kernel - Re: [PATCH] sched: Fix tracepoint called from set_tsk_need

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Message-ID: <20260203132613.GA438882@pauld.westford.csb>
Date: Tue, 3 Feb 2026 08:26:13 -0500
From: Phil Auld <pauld@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, gmonaco@...hat.com,
	Juri Lelli <juri.lelli@...hat.com>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] sched: Fix tracepoint called from set_tsk_need_resched()
 more

Hi Peter,

On Thu, Jan 29, 2026 at 05:09:25PM +0100 gmonaco@...hat.com wrote:
> On Thu, 2026-01-29 at 11:05 -0500, Phil Auld wrote:
> > This raw tracepoint is added to set_tsk_need_resched() which
> > introduces
> > two symbols which were then exported GPL-only. While generally better
> > to add new symbols GPL-only, set_tsk_need_resched() is called from
> > places
> > that are exported without that restriction. This includes things like
> > wake_up_process(). Export these new symbols without the added
> > restriction.
> > 
> > Fixes: 8d737320166b ("sched: Fix build for modules using
> > set_tsk_need_resched()")
> > Fixes: 6c125b85f3c8 ("sched: Export hidden tracepoints to modules")
> > Fixes: adcc3bfa8806 ("sched: Adapt sched tracepoints for RV task
> > model")
> 
> Looks good to me, thanks!
> 
> Reviewed-by: Gabriele Monaco <gmonaco@...hat.com>


Thoughts on this one?


Thanks,
Phil

> 
> > 
> > Signed-off-by: Phil Auld <pauld@...hat.com>
> > ---
> > 
> > This is against tip:sched/core (377521af0341).
> > 
> > 
> > 
> >  kernel/sched/core.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index c5431afe23b0..2871369c05fa 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -121,7 +121,8 @@
> > EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
> >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp);
> >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_entry_tp);
> >  EXPORT_TRACEPOINT_SYMBOL_GPL(sched_exit_tp);
> > -EXPORT_TRACEPOINT_SYMBOL_GPL(sched_set_need_resched_tp);
> > +/* This needs non-GPL-only. It's called from other non-GPL-only
> > exports (e.g. wake_up_process()) */
> > +EXPORT_TRACEPOINT_SYMBOL(sched_set_need_resched_tp);
> >  
> >  DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
> >  DEFINE_PER_CPU(struct rnd_state, sched_rnd_state);
> > @@ -1139,7 +1140,8 @@ void __trace_set_need_resched(struct
> > task_struct *curr, int tif)
> >  {
> >  	trace_sched_set_need_resched_tp(curr, smp_processor_id(),
> > tif);
> >  }
> > -EXPORT_SYMBOL_GPL(__trace_set_need_resched);
> > +/* This needs non-GPL-only. It's called from other non-GPL-only
> > exports (e.g. wake_up_process()) */
> > +EXPORT_SYMBOL(__trace_set_need_resched);
> >  
> >  void resched_curr(struct rq *rq)
> >  {
> 

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