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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-03-31 13:13:02 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-04-29 08:45:13 -0700 |
| commit | 71a9b26963f8c2d0df6f782e2b29ccefc22d4fba (patch) | |
| tree | 7455596d0d31cf2f4a0a3c42359ace0e703a313c | |
| parent | a381d757d93f6e43063f74888676edd6216d0aff (diff) | |
| download | linux-71a9b26963f8c2d0df6f782e2b29ccefc22d4fba.tar.gz | |
rcu: Document RCU_INIT_POINTER()'s lack of ordering guarantees
Although rcu_assign_pointer() provides ordering guarantees,
RCU_INIT_POINTER() does not. This commit makes that explicit
in the docbook comment header.
Reported-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| -rw-r--r-- | include/linux/rcupdate.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index fdc422f3d61d..3c5ef02ea580 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -949,6 +949,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) * pointers, but you must use rcu_assign_pointer() to initialize the * external-to-structure pointer -after- you have completely initialized * the reader-accessible portions of the linked structure. + * + * Note that unlike rcu_assign_pointer(), RCU_INIT_POINTER() provides no + * ordering guarantees for either the CPU or the compiler. */ #define RCU_INIT_POINTER(p, v) \ do { \ |