[PATCH] mutex: Improve mutex_spin_on_owner() code generation

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxxxxx> wrote:

> although the double unrolled need_resched() check looks silly:
> 
>   4d:	48 8b 80 10 c0 ff ff 	mov    -0x3ff0(%rax),%rax
>   54:	a8 08                	test   $0x8,%al
> 
>   75:	48 8b 81 10 c0 ff ff 	mov    -0x3ff0(%rcx),%rax
>   7c:	a8 08                	test   $0x8,%al

The patch below fixes that and shaves 40 bytes off 
mutex_spin_on_owner()'s code size.

Thanks,

	Ingo

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