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authorChristoph Lameter <clameter@sgi.com>2007-12-18 16:22:46 -0800
committerTony Luck <tony.luck@intel.com>2007-12-18 16:22:46 -0800
commita3ebdb6c423dff420168a3faf25c76e9e5f59258 (patch)
tree397317fda83da7f745d802d5ba87735f163bf1c9 /include/asm-ia64/bitops.h
parentc63a1190368771b8207d86c4217ae4afdf1cbd5e (diff)
downloadop-kernel-dev-a3ebdb6c423dff420168a3faf25c76e9e5f59258.zip
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IA64: Slim down __clear_bit_unlock
__clear_bit_unlock does not need to perform atomic operations on the variable. Avoid a cmpxchg and simply do a store with release semantics. Add a barrier to be safe that the compiler does not do funky things. Tony: Use intrinsic rather than inline assembler Signed-off-by: Christoph Lameter <clameter@sgi.com> Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/bitops.h')
-rw-r--r--include/asm-ia64/bitops.h17
1 files changed, 14 insertions, 3 deletions
diff --git a/include/asm-ia64/bitops.h b/include/asm-ia64/bitops.h
index a977aff..a1b9719 100644
--- a/include/asm-ia64/bitops.h
+++ b/include/asm-ia64/bitops.h
@@ -124,10 +124,21 @@ clear_bit_unlock (int nr, volatile void *addr)
/**
* __clear_bit_unlock - Non-atomically clear a bit with release
*
- * This is like clear_bit_unlock, but the implementation may use a non-atomic
- * store (this one uses an atomic, however).
+ * This is like clear_bit_unlock, but the implementation uses a store
+ * with release semantics. See also __raw_spin_unlock().
*/
-#define __clear_bit_unlock clear_bit_unlock
+static __inline__ void
+__clear_bit_unlock(int nr, volatile void *addr)
+{
+ __u32 mask, new;
+ volatile __u32 *m;
+
+ m = (volatile __u32 *)addr + (nr >> 5);
+ mask = ~(1 << (nr & 31));
+ new = *m & mask;
+ barrier();
+ ia64_st4_rel_nta(m, new);
+}
/**
* __clear_bit - Clears a bit in memory (non-atomic version)
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