linux-kernel - Re: [PATCH] objtool: fix build of 64-bit kernel with 32-bit userspace

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Date:   Mon, 27 Nov 2017 13:27:43 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Sven Joachim <svenjoac@....de>
Cc:     Mikulas Patocka <mpatocka@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Jiri Slaby <jslaby@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] objtool: fix build of 64-bit kernel with 32-bit userspace

On Mon, Nov 27, 2017 at 06:32:48PM +0100, Sven Joachim wrote:
> On 2017-11-07 11:55 -0600, Josh Poimboeuf wrote:
> 
> > [ Adding Ingo to cc because I believe it was his suggestion to hide the
> >   guess unwinder behind CONFIG_EXPERT. ]
> >
> > On Mon, Nov 06, 2017 at 06:27:53PM -0500, Mikulas Patocka wrote:
> >> This patch fixes building of 64-bit kernel on 32-bit userspace (I tested 
> >> it on RHEL-6-i686 and Debian-Sid-x32).
> >
> > Thanks, I'll review the patch.
> 
> Any news on that?  After upgrading to 4.15-rc1 and running
> "make oldconfig" I found out that the kernel would no longer build
> unless I selected CONFIG_UNWINDER_FRAME_POINTER=y.
> 
> ,----
> | $ uname -m
> | x86_64
> | $ dpkg --print-architecture 
> | i386
> `----

Sorry, I was traveling last week and I'm still getting caught up.  I'll
take a look at it this week.

-- 
Josh