linux-kernel - Re: [PATCH 0/2] Clean up x86

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Message-ID: <20201006083205.GN2628@hirez.programming.kicks-ass.net>
Date:   Tue, 6 Oct 2020 10:32:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Brian Gerst <brgerst@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>
Subject: Re: [PATCH 0/2] Clean up x86_32 stackprotector

On Mon, Oct 05, 2020 at 07:10:39PM -0400, Brian Gerst wrote:
> On Mon, Oct 5, 2020 at 3:30 PM Andy Lutomirski <luto@...nel.org> wrote:
> >
> > x86_32 stackprotector is a maintenance nightmare.  Clean it up.  This
> > disables stackprotector on x86_32 on GCC 8.1 and on all clang
> > versions -- I'll file a bug for the latter.
> 
> This should be doable on 64-bit too.  All that would need to be done
> is to remove the zero-base of the percpu segment (which would simplify
> alot of other code).

Like what?

I don't think it'd be hard to do, but I really don't see it doing
anything other than make things confusing as heck.