arm64: hw-breakpoint: Remove superfluous SMP function call

Since commit 1cf4f62 ("cpu/hotplug: Move online calls to hotplugged cpu") it is ensured that callbacks of CPU_ONLINE and CPU_DOWN_PREPARE are processed on the hotplugged CPU. Due to this SMP function calls are no longer required. Replace smp_call_function_single() with a direct call of hw_breakpoint_reset(). To keep the calling convention, interrupts are explicitly disabled around the call. Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Signed-off-by: Anna-Maria Gleixner <[email protected]> Signed-off-by: Will Deacon <[email protected]>
dtwlin · Apr 14, 2016 · 4bc4927 · 4bc4927
1 parent 499c815
commit 4bc4927
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
@@ -886,9 +886,11 @@ static int hw_breakpoint_reset_notify(struct notifier_block *self,
 						unsigned long action,
 						void *hcpu)
 {
-	int cpu = (long)hcpu;
-	if ((action & ~CPU_TASKS_FROZEN) == CPU_ONLINE)
-		smp_call_function_single(cpu, hw_breakpoint_reset, NULL, 1);
+	if ((action & ~CPU_TASKS_FROZEN) == CPU_ONLINE) {
+		local_irq_disable();
+		hw_breakpoint_reset(NULL);
+		local_irq_enable();
+	}
 	return NOTIFY_OK;
 }