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rcu: Document that rcu_barrier() hurries lazy callbacks

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This commit adds to the rcu_barrier() kerneldoc header stating that this
function hurries lazy callbacks and that it does not normally result in
additional RCU grace periods.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2025-06-23 12:39:55 -07:00
parent 61399e0c54
commit faab3ae329
1 changed files with 5 additions and 0 deletions
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5
kernel/rcu/tree.c
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@ -3800,6 +3800,11 @@ static void rcu_barrier_handler(void *cpu_in)
* to complete. For example, if there are no RCU callbacks queued anywhere
* in the system, then rcu_barrier() is within its rights to return
* immediately, without waiting for anything, much less an RCU grace period.
* In fact, rcu_barrier() will normally not result in any RCU grace periods
* beyond those that were already destined to be executed.
*
* In kernels built with CONFIG_RCU_LAZY=y, this function also hurries all
* pending lazy RCU callbacks.
*/
void rcu_barrier(void)
{