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

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Message-ID: <5659104.6O7AZx76W6@wuerfel>
Date:	Fri, 18 Jul 2014 11:55:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	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 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.

	Arnd
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