Directed yield: direct yield of spinlocks for powerpc.
PATCH 2/3 Directed yield: direct yield of spinlocks for powerpc.
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(-)
include/asm-powerpc/spinlock.h +3 -3
@@ -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 -----
Signature · 8 lines
blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin.