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arm64/debug: 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 to
clear_os_lock(). The function writes the OSLAR register to clear OS
locking. This does not require to be called with interrupts disabled,
therefore the smp_call_function_single() calling convention is not
preserved.

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 10:42:28 +02:00 committed by Will Deacon
parent 97740051dd
commit 499c81507f
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kernel/debug-monitors.c
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@ -135,9 +135,8 @@ static void clear_os_lock(void *unused)
static int os_lock_notify(struct notifier_block *self,
unsigned long action, void *data)
{
int cpu = (unsigned long)data;
if ((action & ~CPU_TASKS_FROZEN) == CPU_ONLINE)
smp_call_function_single(cpu, clear_os_lock, NULL, 1);
clear_os_lock(NULL);
return NOTIFY_OK;
}