srcutree: Suppress srcu_advance_state() mutex_lock in atomic

The new SRCU_READ_FLAVOR_ATOMIC prohibits sleeping in both readers and
grace-period waits in order to permit waiting on an SRCU grace period
within an OOM notifier.  This means that srcu_advance_state() cannot
acquire ->srcu_gp_mutex in this case, because mutex_lock() can sleep.

This commit therefore adds an is_atomic parameter to srcu_advance_state().
When this parameter is false, current behavior is maintained, in other
words, ->srcu_gp_mutex is acquired and released as before.  But when this
is_atomic parameter is false, the caller is responsible for excluding
other callers.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

0 files changed, 0 insertions, 0 deletions