smp: Make generic_exec_single() public

generic_exec_single() is quite handy for sending asynchronous IPIs without the baggage that comes with smp_call_function_single_async(). Make it public so that it can be (carefully) utilized. Signed-off-by: Sultan Alsawaf <[email protected]> Signed-off-by: Kazuki Hashimoto <[email protected]>
Official-Ayrton990 · Jul 3, 2022 · c232299 · c232299
1 parent 9122624
commit c232299
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/include/linux/smp.h b/include/linux/smp.h
@@ -101,6 +101,8 @@ extern void smp_cpus_done(unsigned int max_cpus);
 /*
  * Call a function on all other processors
  */
+int generic_exec_single(int cpu, struct __call_single_data *csd,
+			smp_call_func_t func, void *info);
 void smp_call_function(smp_call_func_t func, void *info, int wait);
 void smp_call_function_many(const struct cpumask *mask,
 			    smp_call_func_t func, void *info, bool wait);

diff --git a/kernel/smp.c b/kernel/smp.c
@@ -128,7 +128,8 @@ static __always_inline void csd_lock(call_single_data_t *csd)
 
 static __always_inline void csd_unlock(call_single_data_t *csd)
 {
-	WARN_ON(!(csd->flags & CSD_FLAG_LOCK));
+	if (!(csd->flags & CSD_FLAG_LOCK))
+		return;
 
 	/*
 	 * ensure we're all done before releasing data:
@@ -145,7 +146,7 @@ extern void send_call_function_single_ipi(int cpu);
  * for execution on the given CPU. data must already have
  * ->func, ->info, and ->flags set.
  */
-static int generic_exec_single(int cpu, call_single_data_t *csd,
+int generic_exec_single(int cpu, call_single_data_t *csd,
 			       smp_call_func_t func, void *info)
 {
 	if (cpu == smp_processor_id()) {