linux-kernel - Re: [PATCH V7 01/18] perf/core: Use static_call to optimize perf_guest_info

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Date:   Fri, 2 Jul 2021 13:22:00 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Zhu Lingshan <lingshan.zhu@...el.com>
Cc:     pbonzini@...hat.com, bp@...en8.de, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, weijiang.yang@...el.com,
        kan.liang@...ux.intel.com, ak@...ux.intel.com,
        wei.w.wang@...el.com, eranian@...gle.com, liuxiangdong5@...wei.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        like.xu.linux@...il.com, Like Xu <like.xu@...ux.intel.com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Guo Ren <guoren@...nel.org>, Nick Hu <nickhu@...estech.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-csky@...r.kernel.org, linux-riscv@...ts.infradead.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH V7 01/18] perf/core: Use static_call to optimize
 perf_guest_info_callbacks

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().