sched: membarrier: document memory ordering scenarios

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Document membarrier ordering scenarios in membarrier.c. Thanks to Alan
Stern for refreshing my memory. Now that I have those in mind, it seems
appropriate to serialize them to comments for posterity.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201020134715.13909-4-mathieu.desnoyers@efficios.com

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Mathieu Desnoyers 2020-10-20 09:47:15 -04:00 • committed by Peter Zijlstra

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commit 25595eb6aa

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kernel/sched/membarrier.c

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