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[patch 30/66] KVM: x86: Remove superfluous SMP function call

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  [patch 30/66] KVM: x86: Remove superfluous SMP function call Anna-Maria Gleixner <anna-maria@linutronix.de> - 2016-07-11 14:50 +0200

#1440592 — [patch 30/66] KVM: x86: Remove superfluous SMP function call

From: Anna-Maria Gleixner <anna-maria@linutronix.de>

Since commit 1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")
the CPU_ONLINE and CPU_DOWN_PREPARE notifiers are always run on the hot
plugged CPU, and as of commit 3b9d6da67e11 ("cpu/hotplug: Fix rollback during
error-out in __cpu_disable()") the CPU_DOWN_FAILED notifier also runs on the
hot plugged CPU.  This patch converts the SMP functional calls into direct
calls.

smp_function_call_single() executes the function with interrupts
disabled. This calling convention is not preserved because there is no reason
to do so.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
---
 arch/x86/kvm/x86.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5667,10 +5667,10 @@ static int kvmclock_cpu_notifier(struct
 	switch (action) {
 		case CPU_ONLINE:
 		case CPU_DOWN_FAILED:
-			smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
+			tsc_khz_changed(NULL);
 			break;
 		case CPU_DOWN_PREPARE:
-			smp_call_function_single(cpu, tsc_bad, NULL, 1);
+			tsc_bad(NULL);
 			break;
 	}
 	return NOTIFY_OK;

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