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

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Date:	Wed, 1 Apr 2015 10:56:00 +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.

(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
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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