linux-kernel - Re: [PATCH] x86: Drop 32-bit support ... finally.

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Date:	Wed, 1 Apr 2015 11:38:31 +0200
From:	Robert Richter <rric@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andy Lutomirski <luto@...capital.net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Jörg Rödel <joro@...tes.org>,
	Jiri Kosina <jkosina@...e.cz>, Jeff Mahoney <jeffm@...e.com>,
	Michal Hocko <mhocko@...e.cz>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andre Przywara <andre@...rep.de>,
	Andreas Herrmann <herrmann.der.user@...il.com>,
	Richard Weinberger <richard@....at>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: Drop 32-bit support ... finally.

On 01.04.15 10:56:00, Robert Richter wrote:
> (cc'ing Andi)
> 
> > On Wed, Apr 01, 2015 at 10:15:58AM +0200, Borislav Petkov wrote:
> > > From: Borislav Petkov <bp@...e.de>
> > > 
> > > Today, April 1st 2015, marks almost 15 years since the introduction of
> > > the 64-bit extensions to the x86 architecture. And frankly, 15 years was
> > > a graceful period enough for people to move to 64-bit. Therefore, today,
> > > I'm removing 32-bit support from x86 Linux. And it was about friggin'
> > > time...
> 
> No, I vaguely remember booting the first 64 bit cpu (on real hw) for
> the 2002-2003 time frame. I need to check my memories on a more exact
> date, but you guys from Suse should know better. So 15 years are not

Looks like Feb 7 2002, assuming this is genuine:

 http://www.theinquirer.net/inquirer/news/1049122/amd-microsoft-hammer-memo-leaked

Not sure about Linux first booting 64 bit.

-Robert

> yet over and I really would like to wait at least until then. Another
> question is if 64-bit simulators take into account here.
> 
> Though, I assume a discussion on this topic will at least take 1-2
> years, so it's good to start with it now. Also, I really would like to
> finally switch off and retire my K7 which still runs some regression
> tests (will need to check the actual used kernel version). It was a
> good time, but now I realize it's somehow over. Considering this and
> apart from my concerns above:
> 
> Acked-by: Robert Richter <rric@...nel.org>
> 
> -Robert
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