rcu: Add early return for tasks only on per-CPU blocked list
Add a check for t->rcu_blocked_node being NULL after removing the task
from the per-CPU blocked list. If NULL, the task was only on the per-CPU
list and not on the rcu_node's blkd_tasks list, so we can skip all the
rnp lock acquisition and quiescent state reporting.
Currently this path is not taken since tasks are always added to both
lists. This prepares for a future optimization where tasks will initially
be added only to the per-CPU list and promoted to the rnp list only when
a grace period needs to wait for them.
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
1 file changed
