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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-08-03 22:38:51 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 15:08:08 +0300 |
| commit | 6c502b14ba66da0670a59e20354469fa56eab26c (patch) | |
| tree | 5a679c428171685fe7328744ae9dab32f5e0ba00 /include/linux/rcutiny.h | |
| parent | 76ea364161e72b1878126edf8d507d2a62fb47b0 (diff) | |
| download | linux-6c502b14ba66da0670a59e20354469fa56eab26c.tar.xz | |
rcu: Add full-sized polling for start_poll_expedited()
The start_poll_synchronize_rcu_expedited() 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
start_poll_synchronize_rcu_expedited_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/rcutiny.h')
| -rw-r--r-- | include/linux/rcutiny.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 6bc30e46a819..653e35777a99 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -49,6 +49,11 @@ static inline unsigned long start_poll_synchronize_rcu_expedited(void) return start_poll_synchronize_rcu(); } +static inline void start_poll_synchronize_rcu_expedited_full(struct rcu_gp_oldstate *rgosp) +{ + rgosp->rgos_norm = start_poll_synchronize_rcu_expedited(); +} + static inline void cond_synchronize_rcu_expedited(unsigned long oldstate) { cond_synchronize_rcu(oldstate); |