[PATCH 14/14] powerpc/64s: idle runlatch switch is done with MSR[EE]=0

[Vaidyanathan Srinivasan]

* Nicholas Piggin <npiggin at gmail.com> [2017-06-12 09:58:35]:

> 2*mfmsr and 2*mtmsr can be avoided in the idle sleep/wake code
> because we know the MSR[EE] is clear.

Good optimization for powernv.
 
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>

Acked-by: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>

> ---
>  arch/powerpc/platforms/powernv/idle.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
> index ee416e016387..84c55a5ef7ea 100644
> --- a/arch/powerpc/platforms/powernv/idle.c
> +++ b/arch/powerpc/platforms/powernv/idle.c
> @@ -291,9 +291,9 @@ static unsigned long __power7_idle_type(unsigned long type)
>  	if (!prep_irq_for_idle_irqsoff())
>  		return 0;
> 
> -	ppc64_runlatch_off();
> +	__ppc64_runlatch_off();
>  	srr1 = power7_idle_insn(type);
> -	ppc64_runlatch_on();
> +	__ppc64_runlatch_on();
> 
>  	fini_irq_for_idle_irqsoff();
> 
> @@ -328,9 +328,9 @@ static unsigned long __power9_idle_type(unsigned long stop_psscr_val,
>  	psscr = mfspr(SPRN_PSSCR);
>  	psscr = (psscr & ~stop_psscr_mask) | stop_psscr_val;
> 
> -	ppc64_runlatch_off();
> +	__ppc64_runlatch_off();
>  	srr1 = power9_idle_stop(psscr);
> -	ppc64_runlatch_on();
> +	__ppc64_runlatch_on();
> 
>  	fini_irq_for_idle_irqsoff();
> 
> @@ -365,7 +365,7 @@ unsigned long pnv_cpu_offline(unsigned int cpu)
>  	unsigned long srr1;
>  	u32 idle_states = pnv_get_supported_cpuidle_states();
> 
> -	ppc64_runlatch_off();
> +	__ppc64_runlatch_off();
> 
>  	if (cpu_has_feature(CPU_FTR_ARCH_300) && deepest_stop_found) {
>  		unsigned long psscr;
> @@ -392,7 +392,7 @@ unsigned long pnv_cpu_offline(unsigned int cpu)
>  		HMT_medium();
>  	}
> 
> -	ppc64_runlatch_on();
> +	__ppc64_runlatch_on();
> 
>  	return srr1;
>  }
> -- 
> 2.11.0
>