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locking/barriers: Convert users of lockless_dereference() to READ_ONCE()

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READ_ONCE() now has an implicit smp_read_barrier_depends() call, so it
can be used instead of lockless_dereference() without any change in
semantics.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1508840570-22169-4-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Will Deacon
2017-10-24 11:22:48 +01:00
committed by Ingo Molnar
parent 76ebbe78f7
commit 506458efaf
13 changed files with 27 additions and 27 deletions
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4
include/linux/rculist.h
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@@ -274,7 +274,7 @@ static inline void list_splice_tail_init_rcu(struct list_head *list,
* primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
*/
#define list_entry_rcu(ptr, type, member) \
container_of(lockless_dereference(ptr), type, member)
container_of(READ_ONCE(ptr), type, member)
/*
* Where are list_empty_rcu() and list_first_entry_rcu()?
@@ -367,7 +367,7 @@ static inline void list_splice_tail_init_rcu(struct list_head *list,
* example is when items are added to the list, but never deleted.
*/
#define list_entry_lockless(ptr, type, member) \
container_of((typeof(ptr))lockless_dereference(ptr), type, member)
container_of((typeof(ptr))READ_ONCE(ptr), type, member)
/**
* list_for_each_entry_lockless - iterate over rcu list of given type