tree 1590a724b9a40458ba1a990ceb41fc51839196fc
parent ab5c780913bca0a5763ca05dd5c2cb5cb08ccb26
author Andreas Larsson <andreas@gaisler.com> 1415199128 +0100
committer David S. Miller <davem@davemloft.net> 1415393504 -0800

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>