Messages in this thread | | | Date | Mon, 9 May 2022 17:14:58 +0100 | Subject | Re: [PATCH 09/30] coresight: cpu-debug: Replace mutex with mutex_trylock on panic notifier | From | Suzuki K Poulose <> |
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Hi
On 09/05/2022 14:09, Guilherme G. Piccoli wrote: > On 28/04/2022 05:11, Suzuki K Poulose wrote: >> Hi Guilherme, >> >> On 27/04/2022 23:49, Guilherme G. Piccoli wrote: >>> The panic notifier infrastructure executes registered callbacks when >>> a panic event happens - such callbacks are executed in atomic context, >>> with interrupts and preemption disabled in the running CPU and all other >>> CPUs disabled. That said, mutexes in such context are not a good idea. >>> >>> This patch replaces a regular mutex with a mutex_trylock safer approach; >>> given the nature of the mutex used in the driver, it should be pretty >>> uncommon being unable to acquire such mutex in the panic path, hence >>> no functional change should be observed (and if it is, that would be >>> likely a deadlock with the regular mutex). >>> >>> Fixes: 2227b7c74634 ("coresight: add support for CPU debug module") >>> Cc: Leo Yan <leo.yan@linaro.org> >>> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> >>> Cc: Mike Leach <mike.leach@linaro.org> >>> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> >>> Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> >> >> How would you like to proceed with queuing this ? I am happy >> either way. In case you plan to push this as part of this >> series (I don't see any potential conflicts) : >> >> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> > > Hi Suzuki, some other maintainers are taking the patches to their next > branches for example. I'm working on V2, and I guess in the end would be > nice to reduce the size of the series a bit. > > So, do you think you could pick this one for your coresight/next branch > (or even for rc cycle, your call - this is really a fix)? > This way, I won't re-submit this one in V2, since it's gonna be merged > already in your branch.
I have queued this to coresight/next.
Thanks Suzuki
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