linux-kernel - Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

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Message-ID: <20130108232536.GB28869@liondog.tnic>
Date:	Wed, 9 Jan 2013 00:25:36 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading
 ramdisk and bzImage above 4G

On Tue, Jan 08, 2013 at 03:17:46PM -0800, H. Peter Anvin wrote:
> The only thing that started this was that I got tempted into a
> microoptimization that happens to be valid and documented on Intel,
> but not AMD. Given that it doesn't actually work lretq is probably the
> least insane option.

Well, it would've been good if AMD had implemented the jmp far with
64-bit offset.

And I agree, lretq is way better an option than anything else.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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