Andreas Larsson 1a17fdc4f4 sparc32: Implement xchg and atomic_xchg using ATOMIC_HASH locks ...

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>

2014-11-07 12:51:44 -08:00

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