From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f199.google.com (mail-wr0-f199.google.com [209.85.128.199]) by kanga.kvack.org (Postfix) with ESMTP id 3410C6B0006 for ; Mon, 12 Feb 2018 05:16:29 -0500 (EST) Received: by mail-wr0-f199.google.com with SMTP id k14so8626689wrc.14 for ; Mon, 12 Feb 2018 02:16:29 -0800 (PST) Received: from mail.alarsen.net (joe.alarsen.net. [2a01:4f8:191:10e8:1::fe]) by mx.google.com with ESMTPS id i8si3320448wma.61.2018.02.12.02.16.27 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Feb 2018 02:16:27 -0800 (PST) From: Anders Larsen Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 Date: Mon, 12 Feb 2018 11:16:24 +0100 Message-ID: <4155513.GHlSKmbAgC@alarsen-lx> In-Reply-To: <20180211232556.1fdde355@alans-desktop> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> <20180211232556.1fdde355@alans-desktop> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: owner-linux-mm@kvack.org List-ID: To: Alan Cox Cc: Andy Lutomirski , Mark D Rustad , Adam Borowski , Linus Torvalds , Joerg Roedel , Andy Lutomirski , Joerg Roedel , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , X86 ML , LKML , Linux-MM , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , "Liguori, Anthony" , Daniel Gruss <"dani el.gruss"@iaik.tugraz.at>, Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek On Sunday, 11 February 2018 23:25 Alan Cox wrote: > On Sun, 11 Feb 2018 11:42:47 -0800 > > Andy Lutomirski wrote: > > On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: > > >> On Feb 11, 2018, at 2:59 AM, Adam Borowski wrote: > > >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a > > >>> 32-bit install? > > >> > > >> Quite easy, yeah. Crossgrading userspace is not for the faint of the > > >> heart, but changing just the kernel is fine. > > > > > > ISTR that iscsi doesn't work when running a 64-bit kernel with a 32-bit > > > userspace. I remember someone offered kernel patches to fix it, but I > > > think they were rejected. I haven't messed with that stuff in many > > > years, so perhaps the userspace side now has accommodation for it. It > > > might be something to check on. > > > > > At the risk of suggesting heresy, should we consider removing x86_32 > > support at some point? > > Probably - although it's still relevant for Quark. I can't think of any > other in-production 32bit only processor at this point. Big core Intel > went 64bit 2006 or so, atoms mostly 2008 or so (with some stragglers that > are 32 or 64 bit depending if it's enabled) until 2011 (Cedartrail) FWIW the Atom E6xx series (Tunnel Creek) is 32bit only and still in production; my employer is using those beasts in several devices - and I'm fighting an uphill battle to have those products ship with a recent kernel (for certain values of recent) > If someone stuck a fork in it just after the next long term kernel > release then by the time that expired it would probably be historical > interest only. > > Does it not depend if there is someone crazy enough to maintain it > however - 68000 is doing fine 8) Cheers Anders -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org