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rcupdate: Replace smp_read_barrier_depends() with lockless_dereference()

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Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Pranith Kumar 2014-11-13 14:24:14 -05:00 committed by Paul E. McKenney
parent 536fa40222
commit ac59853c06
1 changed files with 5 additions and 5 deletions
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10
include/linux/rcupdate.h
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@ -582,11 +582,11 @@ static inline void rcu_preempt_sleep_check(void)
})
#define __rcu_dereference_check(p, c, space) \
({ \
typeof(*p) *_________p1 = (typeof(*p) *__force)ACCESS_ONCE(p); \
/* Dependency order vs. p above. */ \
typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \
rcu_lockdep_assert(c, "suspicious rcu_dereference_check() usage"); \
rcu_dereference_sparse(p, space); \
smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
((typeof(*p) __force __kernel *)(_________p1)); \
((typeof(*p) __force __kernel *)(________p1)); \
})
#define __rcu_dereference_protected(p, c, space) \
({ \
@ -603,10 +603,10 @@ static inline void rcu_preempt_sleep_check(void)
})
#define __rcu_dereference_index_check(p, c) \
({ \
typeof(p) _________p1 = ACCESS_ONCE(p); \
/* Dependency order vs. p above. */ \
typeof(p) _________p1 = lockless_dereference(p); \
rcu_lockdep_assert(c, \
"suspicious rcu_dereference_index_check() usage"); \
smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
(_________p1); \
})