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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)
committerDavid S. Miller <davem@davemloft.net>
Fri, 7 Nov 2014 20:51:44 +0000 (12:51 -0800)
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>

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