srcutree: Warn if Tiny SRCU readers are preempted

The fastpath of synchronize_srcu_atomic() should always be taken
because readers always disable preemption.  Therefore, the fact that
synchronize_srcu_atomic() is running at all should mean that all readers
have ended.

But there are always bugs.  And responding to a usage bug with a
too-short SRCU grace period, and thus possibly corrupting memory
is at best a sadistic response so such a bug.  For this reason,
synchronize_srcu_atomic() explicitly waits for readers.  Except that
it does so silently, possibly failing to flag this bug.  This commit
therefore adds a splat if synchronize_srcu_atomic() fails to take the
early exit.

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

0 files changed, 0 insertions, 0 deletions