coresight: tmc-etf: Add comment for store ordering

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Since the function CS_LOCK() has contained memory barrier mb(), it
ensures the visibility of the AUX trace data before updating the
aux_head, thus it's needless to add any explicit barrier anymore.

Add comment to make clear for the barrier usage for ETF.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20210809111407.596077-4-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 19:14:01 +08:00 • committed by Mathieu Poirier

parent 26701ceb4c

commit bd8d06886d

1 changed files with 5 additions and 0 deletions

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

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