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author | Peter Zijlstra <peterz@infradead.org> | 2015-09-18 11:13:10 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2015-09-23 09:54:28 +0200 |
commit | 62e8a3258bda118f24ff462fe04cfbe75b8189b5 (patch) | |
tree | 79edd4b96f8c3495435be8b148127d5738d1db63 /arch/metag/include | |
parent | 90fe65148ea76988d8d5acbf3e578aa74129a490 (diff) | |
download | op-kernel-dev-62e8a3258bda118f24ff462fe04cfbe75b8189b5.zip op-kernel-dev-62e8a3258bda118f24ff462fe04cfbe75b8189b5.tar.gz |
atomic, arch: Audit atomic_{read,set}()
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>
Diffstat (limited to 'arch/metag/include')
-rw-r--r-- | arch/metag/include/asm/atomic_lnkget.h | 2 | ||||
-rw-r--r-- | arch/metag/include/asm/atomic_lock1.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/metag/include/asm/atomic_lnkget.h b/arch/metag/include/asm/atomic_lnkget.h index 21c4c26..a625818 100644 --- a/arch/metag/include/asm/atomic_lnkget.h +++ b/arch/metag/include/asm/atomic_lnkget.h @@ -3,7 +3,7 @@ #define ATOMIC_INIT(i) { (i) } -#define atomic_set(v, i) ((v)->counter = (i)) +#define atomic_set(v, i) WRITE_ONCE((v)->counter, (i)) #include <linux/compiler.h> diff --git a/arch/metag/include/asm/atomic_lock1.h b/arch/metag/include/asm/atomic_lock1.h index f8efe38..0295d9b 100644 --- a/arch/metag/include/asm/atomic_lock1.h +++ b/arch/metag/include/asm/atomic_lock1.h @@ -10,7 +10,7 @@ static inline int atomic_read(const atomic_t *v) { - return (v)->counter; + return READ_ONCE((v)->counter); } /* |