tree b06a7a8950d9e090e3d21eb62524198449ee0cfb
parent 6b4fef6ec689b1dda9c63be77e9a81a52cc39dc1
author Paul E. McKenney <paulmck@kernel.org> 1680565754 -0700
committer Paul E. McKenney <paulmck@kernel.org> 1680565754 -0700

rcu/kvfree: Add debug to check grace periods

This commit adds debugging checks to verify that the required RCU
grace period has elapsed for each kvfree_rcu_bulk_data structure that
arrives at the kvfree_rcu_bulk() function.  These checks make use
of that structure's ->gp_snap field, which has been upgraded from an
unsigned long to an rcu_gp_oldstate structure.  This upgrade reduces
the chances of false positives to nearly zero, even on 32-bit systems,
for which this structure carries 64 bits of state.

Cc: Ziwei Dai <ziwei.dai@unisoc.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>