linux-kernel - Re: [PATCH 00/31 v2] PTI support for x86

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Date:   Sat, 10 Feb 2018 12:22:59 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Adam Borowski <kilobyte@...band.pl>
Cc:     Joerg Roedel <jroedel@...e.de>, Andy Lutomirski <luto@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 00/31 v2] PTI support for x86_32

On Sat, Feb 10, 2018 at 1:15 AM, Adam Borowski <kilobyte@...band.pl> wrote:
>
> Alas, we got some data:
> https://popcon.debian.org/ says 20% of x86 users have i386 as their main ABI
> (current; people with popcon installed).

One of the issues I've seen is that people often simply move a disk
(or copy an installation) when upgrading machines.

Does Debian make it easy to upgrade to a 64-bit kernel if you have a
32-bit install? Because if not, then it's entirely possible that a lot
of people started out with a 32-bit install (maybe they even had a
64-bit kernel, but they started when the 32-bit install was the
default one), and never upgraded their kernel.

It really should be easy to _just_ upgrade the kernel. But if the
distro doesn't support it, most people won't do it.

                Linus