linux-kernel - RE: IO regression after ab8fabd46f on x86 kernels with high memory

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Message-ID: <BLU177-W3672A7BA58CC4EE16F4EEAC39D0@phx.gbl>
Date:	Sun, 2 Jun 2013 18:17:51 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Pierre-Loup A. Griffais" <pgriffais@...vesoftware.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"sonnyrao@...omium.org" <sonnyrao@...omium.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu>
Subject: RE: IO regression after ab8fabd46f on x86 kernels with high memory

> We kernel guys have been asking the distros to ship 64-bit kernels even
> in their 32-bit distros for many years, but concerns of compat issues
> and the desire to deprecate 32-bit userspace seems to have kept that
> from happening.

And now there is another reason: to call 64-bit EFI runtime services.
In retrospect, I would have stuck with 32-bit EFI with 64-bit kernels calling runtime services in compatibility mode, but of course it is too late for that now.

Yuhong Bao 		 	   		  --
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