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Groups > linux.kernel > #1187244

[PATCH tip/core/rcu 06/16] rcu: Use WRITE_ONCE in RCU_INIT_POINTER

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From: Peter Zijlstra <peterz@infradead.org>

For the paranoid amongst us GCC would be in its right to use byte stores
to write our NULL value, tell it not to do that.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 include/linux/rcupdate.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index def6d45ad61c..c63428c1ed8a 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -995,7 +995,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
 #define RCU_INIT_POINTER(p, v) \
 	do { \
 		rcu_dereference_sparse(p, __rcu); \
-		p = RCU_INITIALIZER(v); \
+		WRITE_ONCE(p, RCU_INITIALIZER(v)); \
 	} while (0)
 
 /**
-- 
1.8.1.5

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Thread

[PATCH tip/core/rcu 01/16] rcu: Drop RCU_USER_QS in favor of NO_HZ_FULL "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 15/16] scripts: Make checkpatch.pl warn on expedited RCU grace periods "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
    Re: [PATCH tip/core/rcu 15/16] scripts: Make checkpatch.pl warn on  expedited RCU grace periods Joe Perches <joe@perches.com> - 2015-07-18 00:40 +0200
  [PATCH tip/core/rcu 03/16] rcu: Change return type to bool "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 10/16] rcu: Make rcu_is_watching() really notrace "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 07/16] rcu: Fix obsolete priority-boosting comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 12/16] rcu: Fix backwards RCU_LOCKDEP_WARN() in synchronize_rcu_tasks() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 11/16] rcu: Rename rcu_lockdep_assert() to RCU_LOCKDEP_WARN() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 02/16] rcu: Deinline rcu_read_lock_sched_held() if DEBUG_LOCK_ALLOC "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 05/16] rcu: Hide RCU_NOCB_CPU behind RCU_EXPERT "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 06/16] rcu: Use WRITE_ONCE in RCU_INIT_POINTER "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 04/16] rcu: Add RCU-sched flavors of get-state and cond-sync "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 14/16] rcu: update MAINTAINERS entry "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 16/16] rcu: Don't disable CPU hotplug during OOM notifiers "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 09/16] cpu: Wait for RCU grace periods concurrently "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200
  [PATCH tip/core/rcu 13/16] rcu: Clarify CONFIG_RCU_EQS_DEBUG help text "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-07-18 00:30 +0200

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