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(parent: e1b8c05) | patch
ARM: 8443/1: Adding support for atomic half word exchange
authorSarbojit Ganguly <ganguly.s@samsung.com>
Fri, 9 Oct 2015 11:10:02 +0000 (12:10 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 9 Oct 2015 15:22:54 +0000 (16:22 +0100)
commite8973a889e69cb86cac08bec2863c878c0d27af9
treee38d278665d5998a1f4cc2df2eee8a5608440b32tree | snapshot
parente1b8c05dccc7d3de8c49c92c41b2b5ac7d8275b2commit | diff
ARM: 8443/1: Adding support for atomic half word exchange

Since support for half-word atomic exchange was not there and Qspinlock
on ARM requires it, modified __xchg() to add support for that as well.
ARMv6 and lower does not support ldrex{b,h} so, added a guard code to
prevent build breaks.

Signed-off-by: Sarbojit Ganguly <ganguly.s@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/include/asm/cmpxchg.h diff | blob | history