linux-kernel - Re: [for-next][PATCH 09/18] tracing: Move pipe reference to trace array instead of current

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Date:   Fri, 31 Jul 2020 15:17:20 -0600
From:   dann frazier <dann.frazier@...onical.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ian May <ian.may@...onical.com>
Subject: Re: [for-next][PATCH 09/18] tracing: Move pipe reference to trace
 array instead of current_tracer

On Fri, Jul 31, 2020 at 3:16 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Fri, 31 Jul 2020 13:33:45 -0600
> dann frazier <dann.frazier@...onical.com> wrote:
>
> > > This is marked as "Fixes" but is more of a clean up than a true fix.
> > > Backport if you want, but its not critical.
> >
> > Thanks Steven! In case it helps backport consideration, I wanted to
> > note that this addresses an issue we've seen with users trying to
> > change current_tracer when they happen to have rasdaemon
> > installed. rasdaemon uses the trace_pipe interface at runtime, which
> > therefore blocks changing the current tracer. But of course, unless
> > you know about rasdaemon internals, it isn't exactly an obvious
> > failure mode.
>
> Ah, then this should probably be backported.
>
> When I push to Linus (during the next merge window) and it gets into
> Linus's tree. Feel free to send stable@...r.kernel.org the sha1 of this
> commit, and ask for it to be backported for the above stated reason.

Will do.

 -dann