Re: [PATCH 17/37] x86, pkeys: add functions to fetch PKRU

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH 17/37] x86, pkeys: add functions to fetch PKRU
Date	2015-11-27 11:00 +0100
Message-ID	<qznYR-18E-1@gated-at.bofh.it> (permalink)
References	<qvFhE-7YL-5@gated-at.bofh.it> <qvFrj-82I-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, 16 Nov 2015, Dave Hansen wrote:
> +#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
> +static inline u32 __read_pkru(void)
> +{
> +	unsigned int eax, edx;
> +	unsigned int ecx = 0;
> +	unsigned int pkru;
> +
> +	asm volatile(".byte 0x0f,0x01,0xee\n\t"
> +		     : "=a" (eax), "=d" (edx)
> +		     : "c" (ecx));
> +	pkru = eax;
> +	return pkru;

Wouldn't a simple 'return eax;' be sufficient?

Thanks,

	tglx
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[PATCH 17/37] x86, pkeys: add functions to fetch PKRU Dave Hansen <dave@sr71.net> - 2015-11-17 04:50 +0100
  Re: [PATCH 17/37] x86, pkeys: add functions to fetch PKRU Thomas Gleixner <tglx@linutronix.de> - 2015-11-27 11:00 +0100

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