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atomic, arch: Audit atomic_{read,set}()

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This patch makes sure that atomic_{read,set}() are at least
{READ,WRITE}_ONCE().

We already had the 'requirement' that atomic_read() should use
ACCESS_ONCE(), and most archs had this, but a few were lacking.
All are now converted to use READ_ONCE().

And, by a symmetry and general paranoia argument, upgrade atomic_set()
to use WRITE_ONCE().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Vyukov <dvyukov@google.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>
Cc: james.hogan@imgtec.com
Cc: linux-kernel@vger.kernel.org
Cc: oleg@redhat.com
Cc: will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2015-09-18 11:13:10 +02:00
committed by Ingo Molnar
parent 90fe65148e
commit 62e8a3258b
24 changed files with 53 additions and 53 deletions
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4
arch/x86/include/asm/atomic.h
View File

@@ -24,7 +24,7 @@
*/
static __always_inline int atomic_read(const atomic_t *v)
{
return ACCESS_ONCE((v)->counter);
return READ_ONCE((v)->counter);
}
/**
@@ -36,7 +36,7 @@ static __always_inline int atomic_read(const atomic_t *v)
*/
static __always_inline void atomic_set(atomic_t *v, int i)
{
v->counter = i;
WRITE_ONCE(v->counter, i);
}
/**