linux-kernel - Re: [PATCH] [RFC] making uapi/linux/elfcore.h useful again

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Message-ID: <CAK8P3a3PViCK9RzhwDkXhO_mJvgnfe0=tbFs5X_7JDRQQMujYA@mail.gmail.com>
Date:   Tue, 18 Sep 2018 07:21:13 -0700
From:   Arnd Bergmann <arnd@...db.de>
To:     Joseph Myers <joseph@...esourcery.com>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        GNU C Library <libc-alpha@...rceware.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [RFC] making uapi/linux/elfcore.h useful again

On Mon, Sep 17, 2018 at 5:05 AM Joseph Myers <joseph@...esourcery.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