rcu_sync: Add CONFIG_PROVE_RCU checks

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This commit validates that the caller of rcu_sync_is_idle() holds the
corresponding type of RCU read-side lock, but only in kernels built
with CONFIG_PROVE_RCU=y.  This validation is carried out via a new
rcu_sync_ops->held() method that is checked within rcu_sync_is_idle().

Note that although this does add code to the fast path, it only does so
in kernels built with CONFIG_PROVE_RCU=y.

Suggested-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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This commit is contained in:

Oleg Nesterov 2015-08-21 19:42:50 +02:00 • committed by Paul E. McKenney

parent 82e8c565be

commit 3a518b76af

2 changed files with 26 additions and 0 deletions

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6

include/linux/rcu_sync.h

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20

kernel/rcu/sync.c

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