Messages in this thread Patch in this message | | | Date | Wed, 22 Aug 2007 11:00:43 -0400 | From | Mathieu Desnoyers <> | Subject | [PATCH] define have_arch_cmpxchg() |
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define have_arch_cmpxchg()
* Christoph Lameter (clameter@sgi.com) wrote: > If we really want to do this then the implementation of all of these > components need to result in competitive performance on all platforms. > Here is the first of 2 proposed patches to keep the same performances on architectures that does not implement cmpxchg_local.
Add have_arch_cmpxchg(), which can be used within the body of functions to select between irq disable and local_cmpxchg.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> --- include/linux/hardirq.h | 6 ++++++ 1 file changed, 6 insertions(+)
Index: slab/include/linux/hardirq.h =================================================================== --- slab.orig/include/linux/hardirq.h 2007-08-22 10:27:07.000000000 -0400 +++ slab/include/linux/hardirq.h 2007-08-22 10:27:46.000000000 -0400 @@ -149,4 +149,10 @@ extern void irq_exit(void); #define nmi_enter() do { lockdep_off(); __irq_enter(); } while (0) #define nmi_exit() do { __irq_exit(); lockdep_on(); } while (0) +#ifdef __HAVE_ARCH_CMPXCHG +#define have_arch_cmpxchg() 1 +#else +#define have_arch_cmpxchg() 0 +#endif + #endif /* LINUX_HARDIRQ_H */ -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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