linux-kernel - Re: [PATCH v3 3/7] arch/sparc: Define config parameter CPU_BIG

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Message-ID: <CAMuHMdV0fRdcbDWfafT0_cFSWikfgHghCJ+VkropPW_1wC7hRg@mail.gmail.com>
Date:   Wed, 24 May 2017 11:48:44 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Babu Moger <babu.moger@...cle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        shannon.nelson@...cle.com, haakon.bugge@...cle.com,
        steven.sistare@...cle.com, vijay.ac.kumar@...cle.com,
        jane.chu@...cle.com, sparclinux <sparclinux@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v3 3/7] arch/sparc: Define config parameter CPU_BIG_ENDIAN

On Tue, May 23, 2017 at 11:45 PM, Babu Moger <babu.moger@...cle.com> wrote:
> Found this problem while enabling queued rwlock on SPARC.
> The parameter CONFIG_CPU_BIG_ENDIAN is used to clear the
> specific byte in qrwlock structure. Without this parameter,
> we clear the wrong byte. Here is the code.
>
> static inline u8 *__qrwlock_write_byte(struct qrwlock *lock)
>  {
>         return (u8 *)lock + 3 * IS_BUILTIN(CONFIG_CPU_BIG_ENDIAN);
>  }
>
> Define CPU_BIG_ENDIAN for SPARC to fix it.
>
> Signed-off-by: Babu Moger <babu.moger@...cle.com>
> Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
> Reviewed-by: Jane Chu <jane.chu@...cle.com>
> Reviewed-by: Shannon Nelson <shannon.nelson@...cle.com>
> Reviewed-by: Vijay Kumar <vijay.ac.kumar@...cle.com>
> ---
>  arch/sparc/Kconfig |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
>
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 908f019..2f58c16 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -92,6 +92,10 @@ config ARCH_DEFCONFIG
>  config ARCH_PROC_KCORE_TEXT
>         def_bool y
>
> +config CPU_BIG_ENDIAN
> +       bool
> +       default y if SPARC

def_bool y?

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