linux-kernel - Re: [tip:x86/urgent] x86/CPU: Add native CPUID variants returning a single datum

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Message-ID: <20170110090415.46htye4aczidzvh2@pd.tnic>
Date:   Tue, 10 Jan 2017 10:04:15 +0100
From:   Borislav Petkov <bp@...e.de>
To:     hpa@...or.com
Cc:     linux-tip-commits@...r.kernel.org,
        tip-bot for Borislav Petkov <tipbot@...or.com>,
        mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: [tip:x86/urgent] x86/CPU: Add native CPUID variants returning a
 single datum

On Mon, Jan 09, 2017 at 04:19:29PM -0800, hpa@...or.com wrote:
> Any reason to not make these interfaces (leaf, subleaf) from the start?

Two, actually:

1. I modelled them after the cpuid_<reg>(op) versions

2. I don't think we need the subleaf variant right now.

But, when we do, we can do that when we cross that bridge and add

native_cpuid_<reg>(leaf, subleaf)

which gets called by the native_cpuid_<reg>(leaf) variants.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--