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

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Message-ID: <20130907185942.GG3966@linux.vnet.ibm.com>
Date:	Sat, 7 Sep 2013 11:59:42 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
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 Sat, Sep 07, 2013 at 01:22:57PM +0200, Geert Uytterhoeven wrote:
> 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?

If we always had NR_CPUS defined, that might be a good way to go.
We would of course need acks from the various arch maintainers.  I am
guessing that we are OK for m68k.  ;-)

							Thanx, Paul

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