[PATCH 3/3] smp/ipi:Remove check around csd lock in handler forsmp_call_function variants

[Preeti U Murthy]

call_single_data is always locked by all callers of
arch_send_call_function_single_ipi() or
arch_send_call_function_ipi_mask() which results in execution of
generic_call_function_interrupt() handler.

Hence remove the check for lock on csd in generic_call_function_interrupt()
handler, before unlocking it.

Signed-off-by: Preeti U Murthy <preeti@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx>
Cc: srivatsa.bhat@xxxxxxxxxxxxxxxxxx
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx
---

 kernel/smp.c |   14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index b6981ae..d37581a 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -181,25 +181,13 @@ void generic_smp_call_function_single_interrupt(void)
 
 	while (!list_empty(&list)) {
 		struct call_single_data *csd;
-		unsigned int csd_flags;
 
 		csd = list_entry(list.next, struct call_single_data, list);
 		list_del(&csd->list);
 
-		/*
-		 * 'csd' can be invalid after this call if flags == 0
-		 * (when called through generic_exec_single()),
-		 * so save them away before making the call:
-		 */
-		csd_flags = csd->flags;
-
 		csd->func(csd->info);
 
-		/*
-		 * Unlocked CSDs are valid through generic_exec_single():
-		 */
-		if (csd_flags & CSD_FLAG_LOCK)
-			csd_unlock(csd);
+		csd_unlock(csd);
 	}
 }
 

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