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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-02 19:04:27 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-08-31 02:02:42 +0300 |
| commit | 82fcecfa81855924cc69f3078113cf63dd6c2964 (patch) | |
| tree | d0265b21d92811b8ae717047264573049a3a7e74 /kernel/rcu/tree.c | |
| parent | 65cfe3583b612a22e12fba9a7bbd2d37ca5ad941 (diff) | |
| download | linux-82fcecfa81855924cc69f3078113cf63dd6c2964.tar.xz | |
rcu: Update comments and help text for no more RCU-bh updaters
This commit updates comments and help text to account for the fact that
RCU-bh update-side functions are now simple wrappers for their RCU or
RCU-sched counterparts.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index aedf81a0abd8..158c58d47b07 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -565,7 +565,8 @@ unsigned long rcu_sched_get_gp_seq(void) EXPORT_SYMBOL_GPL(rcu_sched_get_gp_seq); /* - * Return the number of RCU-bh GPs completed thus far for debug & stats. + * Return the number of RCU GPs completed thus far for debug & stats. + * This is a transitional API and will soon be removed. */ unsigned long rcu_bh_get_gp_seq(void) { @@ -3069,13 +3070,13 @@ void kfree_call_rcu(struct rcu_head *head, EXPORT_SYMBOL_GPL(kfree_call_rcu); /* - * Because a context switch is a grace period for RCU-sched and RCU-bh, - * any blocking grace-period wait automatically implies a grace period - * if there is only one CPU online at any point time during execution - * of either synchronize_sched() or synchronize_rcu_bh(). It is OK to - * occasionally incorrectly indicate that there are multiple CPUs online - * when there was in fact only one the whole time, as this just adds - * some overhead: RCU still operates correctly. + * Because a context switch is a grace period for RCU-sched, any blocking + * grace-period wait automatically implies a grace period if there + * is only one CPU online at any point time during execution of either + * synchronize_sched() or synchronize_rcu_bh(). It is OK to occasionally + * incorrectly indicate that there are multiple CPUs online when there + * was in fact only one the whole time, as this just adds some overhead: + * RCU still operates correctly. */ static int rcu_blocking_is_gp(void) { |