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authorPaul E. McKenney <paulmck@kernel.org>2022-08-03 03:04:54 +0300
committerPaul E. McKenney <paulmck@kernel.org>2022-08-31 15:08:08 +0300
commit76ea364161e72b1878126edf8d507d2a62fb47b0 (patch)
treee8dc7f2d60fc85c8455c12ae8040c927d3efe693 /include/linux/rcutree.h
parentf4754ad2922e5a2b08c8aecf33d1ec03d7219fb4 (diff)
downloadlinux-76ea364161e72b1878126edf8d507d2a62fb47b0.tar.xz
rcu: Add full-sized polling for start_poll()
The start_poll_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 the next member of the full-state RCU grace-period polling API, namely the start_poll_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. 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 7b769f1b417a..8f2e0f0b26f6 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -52,6 +52,7 @@ void cond_synchronize_rcu_expedited(unsigned long oldstate);
unsigned long get_state_synchronize_rcu(void);
void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp);
unsigned long start_poll_synchronize_rcu(void);
+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);