Re: [PATCH v3 06/11] perf: Add support for SIGTRAP on perf events

[Peter Zijlstra]

On Wed, Mar 31, 2021 at 02:32:58PM +0200, Marco Elver wrote:
> On Mon, 29 Mar 2021 at 14:07, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
> > (and we might already have a problem on some architectures where there
> > can be significant time between these due to not having
> > arch_irq_work_raise(), so ideally we ought to double check current in
> > your case)
> 
> I missed this bit -- just to verify: here we want to check that
> event->ctx->task == current, in case the the irq_work runs when the
> current task has already been replaced. Correct?

Yeah, just not sure what a decent failure would be, silent ignore seems
undesired, maybe WARN and archs that can trigger it get to fix it ?