linux-kernel - Re: [PATCH 11/26] x86, pkeys: add functions for set/fetch PKRU

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Message-ID: <alpine.DEB.2.11.1509222204020.5606@nanos>
Date:	Tue, 22 Sep 2015 22:05:06 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 11/26] x86, pkeys: add functions for set/fetch PKRU

On Wed, 16 Sep 2015, Dave Hansen wrote:

> 
> This adds the raw instructions to access PKRU as well as some
> accessor functions that correctly handle when the CPU does
> not support the instruction.  We don't use them here, but
> we will use read_pkru() in the next patch.
> 
> I do not see an immediate use for write_pkru().  But, we put it
> here for partity with its twin.

So that read_pkru() doesn't feel so lonely? I can't follow that logic.

Thanks,

	tglx
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