Re: [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks

[Waiman Long]

On 02/21/2014 12:08 PM, Waiman Long wrote:
> On 02/21/2014 07:12 AM, Peter Zijlstra wrote:
> > Why is this x86 only code?
>
> The code is making use of the fact that byte write is atomic which is 
> true in x86 and probably in a few other architectures. I could pull 
> these codes into the generic qspinlock.c file and set a flag in the 
> asm header file to activate it if it is what you want.
>
> -Longman

BTW, I also assume that 8-bit and 16-bit cmpxchg() and xchg() are available.

-Longman
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