From: Martin Schwidefsky <[EMAIL PROTECTED]>
[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 <[EMAIL PROTECTED]>
---
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.
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