linux-kernel - Re: [PATCH 06/25] x86, pkeys: PTE bits for storing protection key

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Message-ID: <alpine.DEB.2.11.1510011350470.4500@nanos>
Date:	Thu, 1 Oct 2015 13:51:05 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	borntraeger@...ibm.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	dave.hansen@...ux.intel.com
Subject: Re: [PATCH 06/25] x86, pkeys: PTE bits for storing protection key

On Mon, 28 Sep 2015, Dave Hansen wrote:
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> Previous documentation has referred to these 4 bits as "ignored".
> That means that software could have made use of them.  But, as
> far as I know, the kernel never used them.
> 
> They are still ignored when protection keys is not enabled, so
> they could theoretically still get used for software purposes.
> 
> We also implement "empty" versions so that code that references
> to them can be optimized away by the compiler when the config
> option is not enabled.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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