linux-kernel - Re: [PATCH 1/3] x86: drop unnecessary kernel

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Message-ID: <20110706231711.GA11595@tassilo.jf.intel.com>
Date:	Wed, 6 Jul 2011 16:17:11 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Brian Gerst <brgerst@...il.com>,
	Jan Beulich <JBeulich@...ell.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/3] x86: drop unnecessary kernel_eflags variable from 64
 bit.

> Well lets ask Linus and Andi?

The original idea was that if someone extends EFLAGS with new bits
the BIOS could set them.  Strictly said the Intel Manual 
specifies that ("reserved bits -- always set to values previously read")
 
But that never really worked out and I don't think anyone
would dare extending it now.  So hardcoding is fine I guess.

-Andi
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