Re: [PATCH 4/5] -march=native: REP STOSB

[Andi Kleen]

Alexey Dobriyan <adobriyan@xxxxxxxxx> writes:
>  
> +#ifdef CONFIG_MARCH_NATIVE_REP_STOSB
> +static __always_inline void clear_page(void *page)
> +{
> +	uint32_t len = PAGE_SIZE;
> +	asm volatile (
> +		"rep stosb"
> +		: "+D" (page), "+c" (len)
> +		: "a" (0)
> +		: "memory"
> +	);
> +}

clear_page_64 already patches in the equivalent code sequence,
it's clear_page_erms()

It's very doubtful that this patch is worth it.

-Andi