Re: [PATCH V7 01/18] perf/core: Use static_call to optimize perf_guest_info_callbacks

[Peter Zijlstra]

On Tue, Jun 22, 2021 at 05:42:49PM +0800, Zhu Lingshan wrote:
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 8f71dd72ef95..c71af4cfba9b 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -90,6 +90,27 @@ DEFINE_STATIC_CALL_NULL(x86_pmu_pebs_aliases, *x86_pmu.pebs_aliases);
>   */
>  DEFINE_STATIC_CALL_RET0(x86_pmu_guest_get_msrs, *x86_pmu.guest_get_msrs);
>  
> +DEFINE_STATIC_CALL_RET0(x86_guest_state, *(perf_guest_cbs->state));
> +DEFINE_STATIC_CALL_RET0(x86_guest_get_ip, *(perf_guest_cbs->get_ip));
> +DEFINE_STATIC_CALL_RET0(x86_guest_handle_intel_pt_intr, *(perf_guest_cbs->handle_intel_pt_intr));
> +
> +void arch_perf_update_guest_cbs(void)
> +{
> +	static_call_update(x86_guest_state, (void *)&__static_call_return0);
> +	static_call_update(x86_guest_get_ip, (void *)&__static_call_return0);
> +	static_call_update(x86_guest_handle_intel_pt_intr, (void *)&__static_call_return0);
> +
> +	if (perf_guest_cbs && perf_guest_cbs->state)
> +		static_call_update(x86_guest_state, perf_guest_cbs->state);
> +
> +	if (perf_guest_cbs && perf_guest_cbs->get_ip)
> +		static_call_update(x86_guest_get_ip, perf_guest_cbs->get_ip);
> +
> +	if (perf_guest_cbs && perf_guest_cbs->handle_intel_pt_intr)
> +		static_call_update(x86_guest_handle_intel_pt_intr,
> +				   perf_guest_cbs->handle_intel_pt_intr);
> +}

Coding style wants { } on that last if().