在 2025/2/19 05:33, Ankur Arora 写道:
Needed for cpuidle-haltpoll. Acked-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Ankur Arora <ankur.a.arora@xxxxxxxxxx> --- arch/arm64/kernel/idle.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/kernel/idle.c b/arch/arm64/kernel/idle.c index 05cfb347ec26..b85ba0df9b02 100644 --- a/arch/arm64/kernel/idle.c +++ b/arch/arm64/kernel/idle.c @@ -43,3 +43,4 @@ void __cpuidle arch_cpu_idle(void) */ cpu_do_idle();
Hi, Ankur, With haltpoll_driver registered, arch_cpu_idle() on x86 can select mwait_idle() in idle threads. It use MONITOR sets up an effective address range that is monitored for write-to-memory activities; MWAIT places the processor in an optimized state (this may vary between different implementations) until a write to the monitored address range occurs. Should arch_cpu_idle() on arm64 also use the LDXR/WFE to avoid wakeup IPI like x86 monitor/mwait? Thanks. Shuai
