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arm64: hw-breakpoint: Remove superfluous SMP function call 

Since commit 1cf4f629d9 ("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 <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Anna-Maria Gleixner 2016-04-06 10:42:49 +02:00 committed by Will Deacon
parent 499c81507f
commit 4bc4927440
1 changed files with 5 additions and 3 deletions
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8
arch/arm64/kernel/hw_breakpoint.c
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@ -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;
}