Re: [PATCH 6/6] x86_64: enable xchg optimization for x86_64

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 26 October 2005 00:22, Andi Kleen wrote:
> On Wednesday 26 October 2005 00:13, Paolo 'Blaisorblade' Giarrusso wrote:
> > I.e. the implementation was written, is present in the tree, but due to
> > this:
> >
> > #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
> > #include <linux/rwsem-spinlock.h> /* use a generic implementation */
> > #else
> > #include <asm/rwsem.h> /* use an arch-specific implementation */
> > #endif
> >
> > it was probably _NEVER_ compiled!!!

> Actually it was, but we switched it back because there were some doubts
> on the correctness of the xchg based implementation and the generic
> one looked much cleaner. So far nobody showed a significant performance
> different too.

> I should probably remove asm/rwsem.h.
That's fine too, the current situation is clearly bogus.
Thanks for the quick answer.

> Don't apply please.
Agreed.
-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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