linux-kernel - Re: [PATCH v2] treewide: get rid of HAVE_FUTEX

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Message-ID: <CAMuHMdUYDPrtnj++C3JZYuGqn1xoc=ZG8i8rp2HAdqXe7H7XjA@mail.gmail.com>
Date:   Fri, 25 Jan 2019 19:58:30 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Max Filippov <jcmvbkbc@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Ungerer <gerg@...ux-m68k.org>
Subject: Re: [PATCH v2] treewide: get rid of HAVE_FUTEX_CMPXCHG

Hi Max,

On Fri, Jan 25, 2019 at 7:47 PM Max Filippov <jcmvbkbc@...il.com> wrote:
> CONFIG_HAVE_FUTEX_CMPXCHG is currently used to determine if
> atomic_inatomic is always working or must be probed. For most
> architectures it is either selected, or it is known that they always
> have futex_atomic_cmpxchg_inatomic working.
>
> Drop HAVE_FUTEX_CMPXCHG from the Kconfig and let architectures that may
> not have it working define macro arch_have_futex_cmpxchg that probes
> whether futex_atomic_cmpxchg_inatomic is working, otherwise assume that
> it is working.
>
> Implement arch_have_futex_cmpxchg for MIPS, Xtensa and for the users of
> asm-generic/futex.h.
>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Paul Burton <paul.burton@...s.com>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Suggested-by: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
> ---
> Changes v1->v2:
> - fix #ifdef/#ifndef logic in kernel/futex.c

Thanks for the update!

>  arch/m68k/Kconfig               |  1 -

For m68k:
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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