linux-kernel - Re: [PATCH tip/core/rcu 8/9] nohz_full: Add full-system-idle state machine

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Message-ID: <CAMuHMdXsAfo=LMF8E84_Lyhs+w5c3VKCEe7ZW5Bs7fwFV+J==w@mail.gmail.com>
Date:	Sat, 7 Sep 2013 13:22:57 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, laijs@...fujitsu.com,
	dipankar@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	josh@...htriplett.org, niv@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>, edumazet@...gle.com,
	darren@...art.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Silas Boyd-Wickizer <sbw@....edu>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH tip/core/rcu 8/9] nohz_full: Add full-system-idle state machine

On Fri, Sep 6, 2013 at 8:50 PM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Fri, Sep 6, 2013 at 7:30 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
>>> Furthermore, it seems only hexagon, metag, mips, and x86 set NR_CPUS to 1
>>> if !SMP. On other architectures, NR_CPUS is not defined and presumed to be 0.
>>
>> Would it make sense to require that NR_CPUS=1 for !SMP?
>
> Yes, this looks reasonable to me.

Perhaps we can invert the logic and define only NR_CPUS in arch-specific
code, and derive SMP from NR_CPUS != 1 in generic code?

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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