linux-kernel - Re: [bisected] 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 oopses on s390

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Message-Id: <alpine.LFD.2.21.1804091909270.1698@schleppi>
Date:   Mon, 9 Apr 2018 19:11:00 +0200 (CEST)
From:   Sebastian Ott <sebott@...ux.ibm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Kees Cook <keescook@...omium.org>,
        Sebastian Ott <sebott@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Uecker <Martin.Uecker@....uni-goettingen.de>,
        Ingo Molnar <mingo@...nel.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [bisected] 3c8ba0d61d04ced9f8d9ff93977995a9e4e96e91 oopses on
 s390

On Mon, 9 Apr 2018, Linus Torvalds wrote:
> On Mon, Apr 9, 2018 at 9:18 AM, Sebastian Ott <sebott@...ux.ibm.com> wrote:
> >
> > Both of the following return 0 on my machine:
> > +       pr_warn("%u\n", min_not_zero(100, 1000));
> > +       pr_warn("%u\n", min_not_zero(1000, 100));
> 
> Oooh.
> 
> [ Raises hand, and says "I know, I know, pick me, pick me" ]
> 
> min_not_zero() hasinternal variables "__x" and "__y".
> 
> And "__cmp_once()" has internal variables "__x" and "__y".

Argh....so obvious now :-)

When I change these it works.

Sebastian