linux-kernel - Re: [PATCH] x86/asm: Add support for MOVDIR64B instruction

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Date:   Thu, 1 Aug 2019 22:43:48 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     kirill.shutemov@...ux.intel.com
Cc:     linux-kernel@...r.kernel.org, jing.lin@...el.com, bp@...en8.de,
        tony.luck@...el.com, x86@...nel.org
Subject: Re: [PATCH] x86/asm: Add support for MOVDIR64B instruction

> +static inline void movdir64b(void *dst, const void *src)
> +{
> +	/* movdir64b [rdx], rax */
> +	asm volatile(".byte 0x66, 0x0f, 0x38, 0xf8, 0x02"
> +			: "=m" (*(char *)dst)
                               ^^^^^^^^^^

> +			: "d" (src), "a" (dst));
> +}

Probably needs fake 64-byte type, so that compiler knows what is dirty.