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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-08-02 17:04:54 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 05:08:08 -0700 |
| commit | 76ea364161e72b1878126edf8d507d2a62fb47b0 (patch) | |
| tree | e8dc7f2d60fc85c8455c12ae8040c927d3efe693 /include/linux/rcutiny.h | |
| parent | f4754ad2922e5a2b08c8aecf33d1ec03d7219fb4 (diff) | |
| download | linux-stable-76ea364161e72b1878126edf8d507d2a62fb47b0.tar.gz linux-stable-76ea364161e72b1878126edf8d507d2a62fb47b0.tar.bz2 linux-stable-76ea364161e72b1878126edf8d507d2a62fb47b0.zip | |
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/rcutiny.h')
| -rw-r--r-- | include/linux/rcutiny.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/rcutiny.h b/include/linux/rcutiny.h index 6e299955c4e9..6bc30e46a819 100644 --- a/include/linux/rcutiny.h +++ b/include/linux/rcutiny.h @@ -26,6 +26,12 @@ static inline void get_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) } unsigned long start_poll_synchronize_rcu(void); + +static inline void start_poll_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) +{ + rgosp->rgos_norm = start_poll_synchronize_rcu(); +} + bool poll_state_synchronize_rcu(unsigned long oldstate); static inline bool poll_state_synchronize_rcu_full(struct rcu_gp_oldstate *rgosp) |