Re: [kvm-unit-tests PATCH v2 1/2] arm: pmu: Declare pmu_stats as volatile

[Shaoqin Huang <shahuang@redhat.com>]

On 11/14/23 01:42, Eric Auger wrote:
> Declare pmu_stats as volatile in order to prevent the compiler
> from caching previously read values. This actually fixes
> pmu-overflow-interrupt failures on some HW.
> 
> Reported-by: Alexandru Elisei <alexandru.elisei@arm.com>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
> ---
>   arm/pmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arm/pmu.c b/arm/pmu.c
> index a91a7b1f..86199577 100644
> --- a/arm/pmu.c
> +++ b/arm/pmu.c
> @@ -328,7 +328,7 @@ asm volatile(
>   	: "x9", "x10", "cc");
>   }
>   
> -static struct pmu_stats pmu_stats;
> +static volatile struct pmu_stats pmu_stats;
>   
>   static void irq_handler(struct pt_regs *regs)
>   {

-- 
Shaoqin