linux-kernel - Re: [stable] [PATCH 1/2] coresight: etb10: Do not call smp_processor

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Message-ID: <a183da32-b933-6ed0-f8b8-703e27d3f15e@arm.com>
Date:   Thu, 9 Jan 2020 14:36:17 +0000
From:   Suzuki Kuruppassery Poulose <suzuki.poulose@....com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mathieu.poirier@...aro.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [stable] [PATCH 1/2] coresight: etb10: Do not call
 smp_processor_id from preemptible

On 09/01/2020 14:35, Sasha Levin wrote:
> 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@...aro.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: stable <stable@...r.kernel.org> # v4.9 to v4.19
>> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.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 !

Suzuki