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authorPaul E. McKenney <paulmck@kernel.org>2022-08-04 23:46:05 +0300
committerPaul E. McKenney <paulmck@kernel.org>2022-08-31 15:08:08 +0300
commitb6fe4917ae4353b397079902cb024ae01f20dfb2 (patch)
treeceacaaa87ca37baffd05550bb0090c6859878287 /include/linux/rcutree.h
parentf21e014345e0abf11fdc2e59fb6eb6d6aa6ae4eb (diff)
downloadlinux-b6fe4917ae4353b397079902cb024ae01f20dfb2.tar.xz
rcu: Add full-sized polling for cond_sync_full()
The cond_synchronize_rcu() API compresses the combined expedited and normal grace-period states into a single unsigned long, which conserves storage, but can miss grace periods in certain cases involving overlapping normal and expedited grace periods. Missing the occasional grace period is usually not a problem, but there are use cases that care about each and every grace period. This commit therefore adds yet another member of the full-state RCU grace-period polling API, which is the cond_synchronize_rcu_full() function. This uses up to three times the storage (rcu_gp_oldstate structure instead of unsigned long), but is guaranteed not to miss grace periods. [ paulmck: Apply feedback from kernel test robot and Julia Lawall. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'include/linux/rcutree.h')
-rw-r--r--include/linux/rcutree.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 7151fd861736..1b44288c027d 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -57,6 +57,7 @@ void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
bool poll_state_synchronize_rcu(unsigned long oldstate);
bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
void cond_synchronize_rcu(unsigned long oldstate);
+void cond_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
bool rcu_is_idle_cpu(int cpu);