Since commit 1cf4f629d9d2 ("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.mari...@arm.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: linux-arm-ker...@lists.infradead.org
Signed-off-by: Anna-Maria Gleixner <anna-ma...@linutronix.de>
---
arch/arm64/kernel/debug-monitors.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/arch/arm64/kernel/debug-monitors.c
+++ b/arch/arm64/kernel/debug-monitors.c
@@ -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;
}
