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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-07-02 09:04:27 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2018-08-30 16:02:42 -0700
commit82fcecfa81855924cc69f3078113cf63dd6c2964 (patch)
treed0265b21d92811b8ae717047264573049a3a7e74 /include/linux/rcutree.h
parent65cfe3583b612a22e12fba9a7bbd2d37ca5ad941 (diff)
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 'include/linux/rcutree.h')
-rw-r--r--include/linux/rcutree.h14
1 files changed, 2 insertions, 12 deletions
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index c789c302a2c9..f7a41323aa54 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -58,18 +58,8 @@ void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
/**
* synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period
*
- * Wait for an RCU-bh grace period to elapse, but use a "big hammer"
- * approach to force the grace period to end quickly. This consumes
- * significant time on all CPUs and is unfriendly to real-time workloads,
- * so is thus not recommended for any sort of common-case code. In fact,
- * if you are using synchronize_rcu_bh_expedited() in a loop, please
- * restructure your code to batch your updates, and then use a single
- * synchronize_rcu_bh() instead.
- *
- * Note that it is illegal to call this function while holding any lock
- * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal
- * to call this function from a CPU-hotplug notifier. Failing to observe
- * these restriction will result in deadlock.
+ * This is a transitional API and will soon be removed, with all
+ * callers converted to synchronize_rcu_expedited().
*/
static inline void synchronize_rcu_bh_expedited(void)
{