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authorMark Rutland2021-11-29 13:06:45 +0000
committerThomas Gleixner2021-12-01 00:06:43 +0100
commit0569b245132c40015281610353935a50e282eb94 (patch)
tree88cb445a3da3d7837dda05ce3ffa8381cc75b1c6 /arch
parent6ce895128b3bff738fe8d9dd74747a03e319e466 (diff)
sched: Snapshot thread flags
Some thread flags can be set remotely, and so even when IRQs are disabled, the flags can change under our feet. Generally this is unlikely to cause a problem in practice, but it is somewhat unsound, and KCSAN will legitimately warn that there is a data race. To avoid such issues, a snapshot of the flags has to be taken prior to using them. Some places already use READ_ONCE() for that, others do not. Convert them all to the new flag accessor helpers. The READ_ONCE(ti->flags) .. cmpxchg(ti->flags) loop in set_nr_if_polling() is left as-is for clarity. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul E. McKenney <paulmck@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lore.kernel.org/r/20211129130653.2037928-4-mark.rutland@arm.com
Diffstat (limited to 'arch')
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