diff options
| author | Andreas Larsson <andreas@gaisler.com> | 2014-11-05 15:52:08 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-07 12:51:44 -0800 |
| commit | 1a17fdc4f4ed06b63fac1937470378a5441a663a (patch) | |
| tree | 1590a724b9a40458ba1a990ceb41fc51839196fc /arch/sparc/include/asm/atomic_32.h | |
| parent | ab5c780913bca0a5763ca05dd5c2cb5cb08ccb26 (diff) | |
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>
Diffstat (limited to 'arch/sparc/include/asm/atomic_32.h')
| -rw-r--r-- | arch/sparc/include/asm/atomic_32.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/atomic_32.h b/arch/sparc/include/asm/atomic_32.h index 765c1776ec9f..0e69b7e7a439 100644 --- a/arch/sparc/include/asm/atomic_32.h +++ b/arch/sparc/include/asm/atomic_32.h @@ -22,7 +22,7 @@ int atomic_add_return(int, atomic_t *); int atomic_cmpxchg(atomic_t *, int, int); -#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) +int atomic_xchg(atomic_t *, int); int __atomic_add_unless(atomic_t *, int, int); void atomic_set(atomic_t *, int); |