Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning

[Linus Torvalds]

On Wed, 7 Jan 2009, Dave Kleikamp wrote:
> 
> Do you need to even do that if CONFIG_DEBUG_PAGEALLOC is unset?

No.

> Something like:
> 
> #ifdef CONFIG_DEBUG_PAGEALLOC
>                 /*
>                  * Need to access the cpu field knowing that
>                  * DEBUG_PAGEALLOC could have unmapped it if
>                  * the mutex owner just released it and exited.
>                  */
>                 if (probe_kernel_address(&thread->cpu, cpu))
>                         break;
> #else
> 		cpu = thread->cpu;
> #endif

yes. That would work fine.

			Linus
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