Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch

[Linus Torvalds <torvalds@osdl.org>]

On Wed, 21 Dec 2005, Nick Piggin wrote:

> Nicolas Pitre wrote:
> > On Tue, 20 Dec 2005, Nick Piggin wrote:
> 
> > > Considering that on UP, the arm should not need to disable interrupts
> > > for this function (or has someone refuted Linus?), how about:
> > 
> > 
> > Kernel preemption.
> > 
> 
> preempt_disable() ?

Yes. It should almost always be faster than physically disabling 
interrupts anyway. Even if it's more instructions.

		Linus
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