Re: [RFC PATCH 2/3] s390/idle: Provide arch specific kcpustat_field_idle()/kcpustat_field_iowait()

[Frederic Weisbecker]

Le Wed, Feb 25, 2026 at 03:51:45PM +0100, Heiko Carstens a écrit :
> diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
> index 4873fe9d891b..19fd1541a0f3 100644
> --- a/arch/s390/kernel/entry.S
> +++ b/arch/s390/kernel/entry.S
> @@ -378,8 +378,13 @@ SYM_CODE_END(pgm_check_handler)
>  SYM_CODE_START(\name)
>  	STMG_LC	%r8,%r15,__LC_SAVE_AREA
>  	GET_LC	%r13
> -	stckf	__LC_INT_CLOCK(%r13)
> +	lg	%r12,__LC_IDLE_DATA(%r13)
> +	asi	__IDLE_SEQUENCE(%r12),1
> +	stcke	__LC_INT_CLOCK(%r13)
>  	stpt	__LC_SYS_ENTER_TIMER(%r13)
> +	mvc	__IDLE_CLOCK_EXIT(16,%r12),__LC_INT_CLOCK(%r13)
> +	ALTERNATIVE "bcr 15,0", "bcr 14,0", ALT_FACILITY(45)
> +	asi	__IDLE_SEQUENCE(%r12),1

Would it be possible to instead do that with &kc->idle_sleeptime_seq ?
This should sum up to a simple increment as well. This way you don't need
those nested seqcounts.

Thanks.

-- 
Frederic Weisbecker
SUSE Labs