coresight: tmc-etr: Add barrier after updating AUX ring buffer

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Since a memory barrier is required between AUX trace data store and
aux_head store, and the AUX trace data is filled with memcpy(), it's
sufficient to use smp_wmb() so can ensure the trace data is visible
prior to updating aux_head.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210809111407.596077-3-leo.yan@linaro.org
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

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Leo Yan 2021-08-09 19:14:00 +08:00 • committed by Mathieu Poirier

parent 4d5d88baa6

commit 26701ceb4c

1 changed files with 8 additions and 0 deletions

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drivers/hwtracing/coresight/coresight-tmc-etr.c

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