Re: [thisops uV2 09/10] x86: this_cpu_cmpxchg andthis_cpu_cmpxchg_double operations

[Eric Dumazet]

Le vendredi 26 novembre 2010 Ã 15:09 -0600, Christoph Lameter a Ãcrit :
...

> +# Emulate 'cmpxchg16b %gs:(%rsi)' except we return the result in
> +# al not via the ZF. Caller will access al to get result.
> +#
> +cmpxchg16b_local_emu:
> +	pushf
> +	cli
> +
> +	cmpq  %gs:(%rsi), %rax
> +	jne not_same
> +	cmpq %gs:8(%rsi), %rdx
> +	jne not_same
> +
> +	movq %rbx,  %gs:(%esi)

	(%rsi) instead of (%esi) ?

> +	movq %rcx, %gs:8(%esi)

	same here

> +
> +	popf
> +	mov $1, %al
> +	ret
> +
> + not_same:
> +	popf
> +	xor  %al,%al
> +	ret
> +
> +CFI_ENDPROC
> +ENDPROC(cmpxchg16b_local_emu)
> 



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