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
References: <20180914113929.953895-1-arnd@arndb.de> <alpine.DEB.2.21.1809171204350.13789@digraph.polyomino.org.uk>
In-Reply-To: <alpine.DEB.2.21.1809171204350.13789@digraph.polyomino.org.uk>
From:   Arnd Bergmann <arnd@arndb.de>
Date:   Tue, 18 Sep 2018 07:21:13 -0700
Message-ID: <CAK8P3a3PViCK9RzhwDkXhO_mJvgnfe0=tbFs5X_7JDRQQMujYA@mail.gmail.com>
Subject: Re: [PATCH] [RFC] making uapi/linux/elfcore.h useful again
To:     Joseph Myers <joseph@codesourcery.com>
Cc:     linux-arch <linux-arch@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>,
        David Howells <dhowells@redhat.com>,
        GNU C Library <libc-alpha@sourceware.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Sep 17, 2018 at 5:05 AM Joseph Myers <joseph@codesourcery.com> wrote:
>
> On Fri, 14 Sep 2018, Arnd Bergmann wrote:
>
> > +typedef unsigned long elf_greg_t;
>
> Does that need to be unsigned long long for x32?  (At least glibc thinks
> so; I've not tested what an x32 core dump actually looks like, but to be
> useful it certainly ought to have 64-bit registers.)

Yes, I think that's right. 'unsigned long' was correct inside of the kernel,
but copying it into a uapi header means we have to use '__kernel_ulong_t'
so it gets interpreted right by x32 user space.

          Arnd