linux-kernel - [tip:x86/apic] x86/apic: Use this_cpu_ptr() in local_timer

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Date:   Tue, 29 Aug 2017 04:07:24 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, rostedt@...dmis.org, mingo@...nel.org,
        bp@...en8.de, torvalds@...ux-foundation.org, luto@...nel.org,
        tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org
Subject: [tip:x86/apic] x86/apic: Use this_cpu_ptr() in
 local_timer_interrupt()

Commit-ID:  3bec6def39e32609e01a68b43476ee1f1c512eaa
Gitweb:     http://git.kernel.org/tip/3bec6def39e32609e01a68b43476ee1f1c512eaa
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 28 Aug 2017 08:47:24 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 29 Aug 2017 11:42:24 +0200

x86/apic: Use this_cpu_ptr() in local_timer_interrupt()

Accessing the per cpu data via per_cpu(, smp_processor_id()) is
pointless. Use this_cpu_ptr() instead.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/20170828064956.829552757@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/apic/apic.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 7a57b54..a33fa44 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -988,8 +988,7 @@ void setup_secondary_APIC_clock(void)
  */
 static void local_apic_timer_interrupt(void)
 {
-	int cpu = smp_processor_id();
-	struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
+	struct clock_event_device *evt = this_cpu_ptr(&lapic_events);
 
 	/*
 	 * Normally we should not be here till LAPIC has been initialized but
@@ -1003,7 +1002,8 @@ static void local_apic_timer_interrupt(void)
 	 * spurious.
 	 */
 	if (!evt->event_handler) {
-		pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu);
+		pr_warning("Spurious LAPIC timer interrupt on cpu %d\n",
+			   smp_processor_id());
 		/* Switch it off */
 		lapic_timer_shutdown(evt);
 		return;