From: Sasha Levin <sashal@kernel.org>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: mathieu.poirier@linaro.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org,
gregkh@linuxfoundation.org
Subject: Re: [stable] [PATCH 1/2] coresight: etb10: Do not call smp_processor_id from preemptible
Date: Thu, 9 Jan 2020 09:35:37 -0500 [thread overview]
Message-ID: <20200109143537.GE1706@sasha-vm> (raw)
In-Reply-To: <20200108110541.318672-1-suzuki.poulose@arm.com>
On Wed, Jan 08, 2020 at 11:05:40AM +0000, Suzuki K Poulose wrote:
>[ Upstream commit 730766bae3280a25d40ea76a53dc6342e84e6513 ]
>
>During a perf session we try to allocate buffers on the "node" associated
>with the CPU the event is bound to. If it is not bound to a CPU, we
>use the current CPU node, using smp_processor_id(). However this is unsafe
>in a pre-emptible context and could generate the splats as below :
>
> BUG: using smp_processor_id() in preemptible [00000000] code: perf/2544
>
>Use NUMA_NO_NODE hint instead of using the current node for events
>not bound to CPUs.
>
>Fixes: 2997aa4063d97fdb39 ("coresight: etb10: implementing AUX API")
>Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
>Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>Cc: stable <stable@vger.kernel.org> # v4.9 to v4.19
>Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
>Link: https://lore.kernel.org/r/20190620221237.3536-5-mathieu.poirier@linaro.org
I've queued this for 4.9-4.19. There was a simple conflict on 4.9 which
also had to be resolved.
--
Thanks,
Sasha
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next prev parent reply other threads:[~2020-01-09 14:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 11:05 [stable] [PATCH 1/2] coresight: etb10: Do not call smp_processor_id from preemptible Suzuki K Poulose
2020-01-08 11:05 ` [stable] [PATCH 2/2] coresight: tmc-etf: " Suzuki K Poulose
2020-01-09 14:35 ` Sasha Levin [this message]
2020-01-09 14:36 ` [stable] [PATCH 1/2] coresight: etb10: " Suzuki Kuruppassery Poulose
2020-01-15 15:11 ` Greg KH
2020-01-15 16:44 ` Suzuki Kuruppassery Poulose
2020-01-15 17:21 ` Greg KH
2020-01-15 17:28 ` Suzuki Kuruppassery Poulose
2020-01-28 8:15 ` Greg KH
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