On Fri, Jul 04, 2025 at 05:34:09PM +0100, Andrew Cooper wrote: > In order elide IPIs, we must be able to identify whether a target CPU is in > MWAIT at the point it is woken up. i.e. the store to wake it up must also > identify the state. > > Create a new in_mwait variable beside __softirq_pending, so we can use a > CMPXCHG to set the softirq while also observing the status safely. Implement > an x86 version of arch_pend_softirq() which does this. > > In mwait_idle_with_hints(), advertise in_mwait, with an explanation of > precisely what it means. X86_BUG_MONITOR can be accounted for simply by not > advertising in_mwait. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Acked-by: Roger Pau Monné <roger....@citrix.com> Thanks, Roger.
