On 03/07/2025 5:01 pm, Roger Pau Monné wrote:
> On Wed, Jul 02, 2025 at 03:41:16PM +0100, Andrew Cooper wrote:
>> cpuidle_wakeup_mwait() is a TOCTOU race. The cpumask_and() sampling
>> cpuidle_mwait_flags can take a arbitrary period of time, and there's no
>> guarantee that the target CPUs are sti
On Wed, Jul 02, 2025 at 03:41:16PM +0100, Andrew Cooper wrote:
> cpuidle_wakeup_mwait() is a TOCTOU race. The cpumask_and() sampling
> cpuidle_mwait_flags can take a arbitrary period of time, and there's no
> guarantee that the target CPUs are still in MWAIT when writing into
> mwait_wakeup(cpu).
cpuidle_wakeup_mwait() is a TOCTOU race. The cpumask_and() sampling
cpuidle_mwait_flags can take a arbitrary period of time, and there's no
guarantee that the target CPUs are still in MWAIT when writing into
mwait_wakeup(cpu).
The consequence of the race is that we'll fail to IPI targets. Also,
