On 07/31/2015 04:39 AM, Peter Zijlstra wrote:
On Wed, Jul 22, 2015 at 04:12:36PM -0400, Waiman Long wrote:
The smp_store_release() is not a full barrier. In order to avoid missed
wakeup, we may need to add memory barrier around locked and cpu state
variables adding to complexity. As the chance of spurious wakeup is very
low, it is easier and safer to just do an unconditional kick at unlock
time.
This needs to better spell out the race; my still sleeping brain doesn't
want to co-operate and its generally better to spell out these things
anyway.
Sure, I will add a comment to talk about the possible race.
Cheers,
Longman
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