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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-03-08 14:20:30 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-27 12:58:37 -0700 |
| commit | 0a0ba1c93f8a0ff28bacec0d1d018081e762e2f0 (patch) | |
| tree | b76fd4bf7358f5a0cdeea2a97ee73485a5c4f720 /kernel/rcu/tree_trace.c | |
| parent | ea46351cea79f54729d8546e5bd7f091a2e6484b (diff) | |
| download | op-kernel-dev-0a0ba1c93f8a0ff28bacec0d1d018081e762e2f0.zip op-kernel-dev-0a0ba1c93f8a0ff28bacec0d1d018081e762e2f0.tar.gz | |
rcu: Adjust ->lock acquisition for tasks no longer migrating
Tasks are no longer migrated away from a given rcu_node structure
when all CPUs corresponding to that rcu_node structure have gone offline.
This means that rcu_read_unlock_special() no longer needs to loop
retrying rcu_node ->lock acquisition because the current task is
guaranteed to stay put.
This commit takes a small and paranoid step towards relying on this
guarantee by placing a WARN_ON_ONCE() just after the early exit from
the lock-acquisition loop.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree_trace.c')
0 files changed, 0 insertions, 0 deletions
