From: Michal Schmidt <[email protected]>
Code after the return statement is dead. Enable preemption before
returning from srcu_drive_gp().
This will be important when/if PREEMPT_AUTO (lazy resched) gets merged.
Fixes: 65b4a59557f6 ("srcu: Make Tiny SRCU explicitly disable preemption")
Reviewed-by: Paul E. McKenney <[email protected]>
Signed-off-by: Michal Schmidt <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>
---
kernel/rcu/srcutiny.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
index 549c03336ee9..4dcbf8aa80ff 100644
--- a/kernel/rcu/srcutiny.c
+++ b/kernel/rcu/srcutiny.c
@@ -122,8 +122,8 @@ void srcu_drive_gp(struct work_struct *wp)
ssp = container_of(wp, struct srcu_struct, srcu_work);
preempt_disable(); // Needed for PREEMPT_AUTO
if (ssp->srcu_gp_running || ULONG_CMP_GE(ssp->srcu_idx,
READ_ONCE(ssp->srcu_idx_max))) {
+ preempt_enable();
return; /* Already running or nothing to do. */
- preempt_enable();
}
/* Remove recently arrived callbacks and wait for readers. */
--
2.46.0
