Fwd: [patch 2/3] Directed yield: direct yield of spinlocks for powerpc.

Fwd: [patch 2/3] Directed yield: direct yield of spinlocks for powerpc.

[Martin Schwidefsky]

From: Martin Schwidefsky <schwidefsky@de.ibm.com>

[patch 2/3] Directed yield: direct yield of spinlocks for powerpc.

In order to implement a spinlock that yields the cpu in favour of
the current lock holder cpu_relax variants for spinlocks and
read/write locks are needed. The new _raw_spin_relax, _raw_read_relax
and _raw_write_relax primitives have an additional argument: the
pointer to the lock structure.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 include/asm-powerpc/spinlock.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff -urpN linux-2.6/include/asm-powerpc/spinlock.h linux-2.6-patched/include/asm-powerpc/spinlock.h
--- linux-2.6/include/asm-powerpc/spinlock.h	2006-09-18 14:12:04.000000000 +0200
+++ linux-2.6-patched/include/asm-powerpc/spinlock.h	2006-09-18 14:12:04.000000000 +0200
@@ -285,9 +285,9 @@ static __inline__ void __raw_write_unloc
 	rw->lock = 0;
 }
 
-#define _raw_spin_relax(lock)	cpu_relax()
-#define _raw_read_relax(lock)	cpu_relax()
-#define _raw_write_relax(lock)	cpu_relax()
+#define _raw_spin_relax(lock)	__spin_yield(lock)
+#define _raw_read_relax(lock)	__rw_yield(lock)
+#define _raw_write_relax(lock)	__rw_yield(lock)
 
 #endif /* __KERNEL__ */
 #endif /* __ASM_SPINLOCK_H */

----- End forwarded message -----

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.