linux-kernel - Re: [PATCH 1/2] arch: Define CPU_BIG_ENDIAN for all fixed big endian archs

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Message-ID: <300417cd-2aed-8464-afc3-00bec56d1d4a@oracle.com>
Date:   Fri, 9 Jun 2017 10:55:13 -0500
From:   Babu Moger <babu.moger@...cle.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        uclinux-h8-devel@...ts.sourceforge.jp,
        Linux/m68k <linux-m68k@...r.kernel.org>,
        openrisc@...ts.librecores.org,
        Parisc List <linux-parisc@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 1/2] arch: Define CPU_BIG_ENDIAN for all fixed big endian
 archs


On 6/9/2017 2:03 AM, Geert Uytterhoeven wrote:
> On Fri, Jun 9, 2017 at 12:17 AM, Babu Moger <babu.moger@...cle.com> wrote:
>> While working on enabling queued rwlock on SPARC, found
>> this following code in include/asm-generic/qrwlock.h
>> which uses CONFIG_CPU_BIG_ENDIAN to clear a byte.
>>
>> static inline u8 *__qrwlock_write_byte(struct qrwlock *lock)
>>   {
>>          return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
>>   }
>>
>> Problem is many of the fixed big endian architectures dont define
>> CPU_BIG_ENDIAN and clears the wrong byte.
>>
>> Define CPU_BIG_ENDIAN for all the fixed big endian architecture.
>>
>> Here is the orinal discussion
>> http://www.spinics.net/lists/devicetree/msg178101.html
>>
>> Signed-off-by: Babu Moger <babu.moger@...cle.com>
>> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Hmm, the link above refers to a mail from me? ;-)
>
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

One more question before I resubmit.

Dave,
I have added CONFIG_CPU_BIG_ENDIAN for sparc via my earlier patch.
https://patchwork.ozlabs.org/patch/766735/
Should I exclude sparc here?
Thanks
Babu

>
> Gr{oetje,eeting}s,
>
>                          Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds