Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
In-Reply-To: <20180210091543.ynypx4y3koz44g7y@angband.pl>
References: <1518168340-9392-1-git-send-email-joro@8bytes.org>
 <CALCETrUF61fqjXKG=kwf83JWpw=kgL16UvKowezDVwVA1=YVAw@mail.gmail.com>
 <20180209191112.55zyjf4njum75brd@suse.de> <20180210091543.ynypx4y3koz44g7y@angband.pl>
From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sat, 10 Feb 2018 12:22:59 -0800
Message-ID: <CA+55aFwdLZjDcfhj4Ps=dUfd7ifkoYxW0FoH_JKjhXJYzxUSZQ@mail.gmail.com>
Subject: Re: [PATCH 00/31 v2] PTI support for x86_32
To:     Adam Borowski <kilobyte@angband.pl>
Cc:     Joerg Roedel <jroedel@suse.de>, Andy Lutomirski <luto@kernel.org>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        "H . Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Juergen Gross <jgross@suse.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Brian Gerst <brgerst@gmail.com>,
        David Laight <David.Laight@aculab.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Eduardo Valentin <eduval@amazon.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Will Deacon <will.deacon@arm.com>,
        "Liguori, Anthony" <aliguori@amazon.com>,
        Daniel Gruss <daniel.gruss@iaik.tugraz.at>,
        Hugh Dickins <hughd@google.com>,
        Kees Cook <keescook@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Waiman Long <llong@redhat.com>, Pavel Machek <pavel@ucw.cz>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Sat, Feb 10, 2018 at 1:15 AM, Adam Borowski <kilobyte@angband.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