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

(off-list ancestor, not in this archive)

On Fri, Jul 02, 2021 at 09:00:22AM -0700, Joe Perches wrote:
On Fri, 2021-07-02 at 13:22 +0200, Peter Zijlstra wrote:
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
[]
@@ -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().
That's just your personal preference.
As a maintainer, those carry weight, also that's tip rules:

  https://lore.kernel.org/lkml/20181107171149.165693799@linutronix.de/ (local)

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