Mikael Pettersson 3f6aa0b113 sparc32: unbreak arch_write_unlock()
The sparc32 version of arch_write_unlock() is just a plain assignment.
Unfortunately this allows the compiler to schedule side-effects in a
protected region to occur after the HW-level unlock, which is broken.
E.g., the following trivial test case gets miscompiled:

	#include <linux/spinlock.h>
	rwlock_t lock;
	int counter;
	void foo(void) { write_lock(&lock); ++counter; write_unlock(&lock); }

Fixed by adding a compiler memory barrier to arch_write_unlock().  The
sparc64 version combines the barrier and assignment into a single asm(),
and implements the operation as a static inline, so that's what I did too.

Compile-tested with sparc32_defconfig + CONFIG_SMP=y.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-15 14:35:19 -07:00
..
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-12-09 00:50:13 -08:00
2008-08-31 20:59:37 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2010-07-24 09:57:52 -06:00
2008-07-27 23:00:59 +02:00
2009-12-16 07:20:12 -08:00
2008-07-27 23:00:59 +02:00
2008-08-31 20:56:15 -07:00
2008-07-27 23:00:59 +02:00
2008-08-24 20:33:56 -07:00
2008-07-27 23:00:59 +02:00
2010-10-26 16:52:08 -07:00
2008-07-27 23:00:59 +02:00
2008-08-29 02:15:23 -07:00
2011-05-12 13:44:29 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2009-01-04 15:44:52 -08:00
2011-04-19 22:11:40 -07:00
2011-03-18 15:03:16 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-12-26 15:35:41 -08:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2011-03-31 11:26:23 -03:00
2010-12-12 14:57:53 -08:00
2008-07-27 23:00:59 +02:00
2010-01-14 03:14:53 -08:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2011-03-31 11:26:23 -03:00
2008-07-27 23:00:59 +02:00
2009-01-02 18:35:29 -08:00
2011-07-26 16:49:47 -07:00
2008-07-27 23:00:59 +02:00
2011-07-26 16:49:43 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-12-27 00:35:12 -08:00
2011-04-21 16:44:44 -07:00
2009-01-02 19:34:46 -08:00
2009-01-02 21:10:04 -08:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2008-07-27 23:00:59 +02:00
2008-09-06 19:30:17 +01:00
2009-01-06 18:10:27 -08:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-09-19 21:18:03 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2011-05-25 08:39:13 -07:00
2008-07-27 23:00:59 +02:00
2011-05-25 08:39:13 -07:00
2009-01-02 21:33:05 -08:00
2011-03-23 19:47:18 -07:00
2010-08-09 00:45:46 -07:00
2010-08-09 00:45:46 -07:00
2008-07-27 23:00:59 +02:00
2011-05-28 10:48:39 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00
2008-08-31 20:59:37 -07:00
2008-07-27 23:00:59 +02:00
2008-07-27 23:00:59 +02:00