rcu/kvfree: Add debug to check grace periods

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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>

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Paul E. McKenney 2023-04-03 16:49:14 -07:00

parent 7e3f926bf4

commit cdfa0f6fa6

1 changed files with 19 additions and 18 deletions

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kernel/rcu/tree.c

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