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rculist: Add ASSERT_EXCLUSIVE_ACCESS() to __list_splice_init_rcu()

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After the sync() in __list_splice_init_rcu(), there should be no
readers traversing the old list.  This commit therefore enlists the
help of KCSAN to verify this condition via a pair of calls to
ASSERT_EXCLUSIVE_ACCESS().

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Marco Elver <elver@google.com>
This commit is contained in:
Paul E. McKenney 2020-02-12 13:29:15 -08:00
parent cb38f82043
commit c93773c1a3
1 changed files with 2 additions and 0 deletions
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include/linux/rculist.h
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@ -248,6 +248,8 @@ static inline void __list_splice_init_rcu(struct list_head *list,
*/
sync();
ASSERT_EXCLUSIVE_ACCESS(*first);
ASSERT_EXCLUSIVE_ACCESS(*last);
/*
* Readers are finished with the source list, so perform splice.