diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2010-07-27 17:01:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-26 17:21:43 -0700 |
| commit | a1a34b6cceb66a843dfbec0a197b0067fe9a8dc9 (patch) | |
| tree | 55e31071c9128ecda297b68f78b1e1d34a5a9c02 /mm/filemap.c | |
| parent | 5d881186be461f3ccea69fe93f674e3266db7336 (diff) | |
x86: Add memory modify constraints to xchg() and cmpxchg()
commit 113fc5a6e8c2288619ff7e8187a6f556b7e0d372 upstream.
[ Backport to .32 by Tomáš Janoušek <tomi@nomi.cz> ]
xchg() and cmpxchg() modify their memory operands, not merely read
them. For some versions of gcc the "memory" clobber has apparently
dealt with the situation, but not for all.
Originally-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Glauber Costa <glommer@redhat.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Peter Palfrader <peter@palfrader.org>
Cc: Greg KH <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Zachary Amsden <zamsden@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
LKML-Reference: <4C4F7277.8050306@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm/filemap.c')
0 files changed, 0 insertions, 0 deletions