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rcu: Mark writes to the rcu_segcblist structure's ->flags field
KCSAN reports data races between the rcu_segcblist_clear_flags() and rcu_segcblist_set_flags() functions, though misreporting the latter as a call to rcu_segcblist_is_enabled() from call_rcu(). This commit converts the updates of this field to WRITE_ONCE(), relying on the resulting unmarked reads to continue to detect buggy concurrent writes to this field. Reported-by: Zhouyi Zhou <zhouzhouyi@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org>
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c099290310
1 changed files with 2 additions and 2 deletions
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@ -56,13 +56,13 @@ static inline long rcu_segcblist_n_cbs(struct rcu_segcblist *rsclp)
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static inline void rcu_segcblist_set_flags(struct rcu_segcblist *rsclp,
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int flags)
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{
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rsclp->flags |= flags;
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WRITE_ONCE(rsclp->flags, rsclp->flags | flags);
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}
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static inline void rcu_segcblist_clear_flags(struct rcu_segcblist *rsclp,
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int flags)
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{
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rsclp->flags &= ~flags;
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WRITE_ONCE(rsclp->flags, rsclp->flags & ~flags);
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}
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static inline bool rcu_segcblist_test_flags(struct rcu_segcblist *rsclp,
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