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sparc32: Implement xchg and atomic_xchg using ATOMIC_HASH locks
authorAndreas Larsson <andreas@gaisler.com>
Wed, 5 Nov 2014 14:52:08 +0000 (15:52 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 21 Nov 2014 17:22:52 +0000 (09:22 -0800)
commit96920746658f98dbdaccc90ab818443471accc89
tree90c3956ca5c0d736056e45ae5fa1b9136edb8459tree | snapshot
parent134712463afbd65c6b11193cd8000c83fc5b3a1bcommit | diff
sparc32: Implement xchg and atomic_xchg using ATOMIC_HASH locks

[ Upstream commit 1a17fdc4f4ed06b63fac1937470378a5441a663a ]

Atomicity between xchg and cmpxchg cannot be guaranteed when xchg is
implemented with a swap and cmpxchg is implemented with locks.
Without this, e.g. mcs_spin_lock and mcs_spin_unlock are broken.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/sparc/include/asm/atomic_32.h diff | blob | history
arch/sparc/include/asm/cmpxchg_32.h diff | blob | history
arch/sparc/lib/atomic32.c diff | blob | history
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