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[ARM] 3165/1: fix atomic_cmpxchg() implementation for ARMv6+
authorNicolas Pitre <nico@cam.org>
Wed, 16 Nov 2005 15:05:11 +0000 (15:05 +0000)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Wed, 16 Nov 2005 15:05:11 +0000 (15:05 +0000)
commita7d068336197945dc4af65c5973c996e526d51cb
treecbe903bef21fce0d5923cc83071b7b66d00d94c4tree | snapshot (tar.gz zip)
parent224b5be6ddc12fa7587433878866cd39e7b935f5commit | diff
[ARM] 3165/1: fix atomic_cmpxchg() implementation for ARMv6+

Patch from Nicolas Pitre

If 'old' and 'oldval' are different then 'res' never gets set.  In that
case, if ever %0 happened to contain anything but zero (rather likely)
then the code will loop forever (or until another CPU just come along
and change the atomic value to match 'old' which is rather unlikely).

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
include/asm-arm/atomic.h diff | blob | blame | history