linux-kernel - Re: [PATCH v2 21/29] nios2: Futex operations

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Message-ID: <CAMuHMdVRwTefEsKOMb2gotq5b7JoQ7Z2a8-5dERD7r4MwJdTvg@mail.gmail.com>
Date:	Tue, 5 Aug 2014 10:49:59 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ley Foon Tan <lftan@...era.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Chung-Lin Tang <cltang@...esourcery.com>
Subject: Re: [PATCH v2 21/29] nios2: Futex operations

On Fri, Jul 18, 2014 at 11:55 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 18 July 2014 11:42:34 Thomas Gleixner wrote:
>> On Fri, 18 Jul 2014, Arnd Bergmann wrote:
>> > On Friday 18 July 2014 14:07:42 Ley Foon Tan wrote:
>> > > On Thu, Jul 17, 2014 at 7:07 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> > If this understanding is right, we can probably just merge the
>> > m68k implementation into the asm-generic version, as that does
>> > exactly that, and just isn't SMP safe. I'm still unsure whether
>> > I'm missing something here though, as everything else seems to
>> > do this in assembly, even for non-SMP machines that could use
>> > the trivial method that m68k has.
>>
>> For UP relying of pagefault disable should be good enough indeed. I
>> guess the asm for the other UP stuff results from looking at
>> architectures or copying from architectures which did this in ASM
>
> Ok, thanks for the confirmation!
>
> Ley Foon Tan, I think the best way forward then is for you to
> take the m68k code and copy (or move) that into asm-generic/futex.h
> under an #ifndef CONFIG_SMP.

Yes, that should work.

I tried that a while ago for OpenRISC, but never cleant it up and sent it out.

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
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