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Date: Tue, 10 Jul 2012 11:18:39 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>, LKML <linux-kernel@vger.kernel.org>,
        Alessio Igor Bogani <abogani@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Avi Kivity <avi@redhat.com>,
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        Geoff Levand <geoff@infradead.org>,
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        Hakan Akkan <hakanakkan@gmail.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@kernel.org>, Kevin Hilman <khilman@ti.com>,
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        Peter Zijlstra <peterz@infradead.org>,
        Stephen Hemminger <shemminger@vyatta.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Sven-Thorsten Dietrich <thebigcorporation@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 6/6] x86: Exit RCU extended QS on notify resume
Message-ID: <20120710091836.GF8185@somewhere.redhat.com>
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On Sun, Jul 08, 2012 at 02:17:07PM -0700, Paul E. McKenney wrote:
> On Fri, Jul 06, 2012 at 01:43:29PM -0700, Josh Triplett wrote:
> > On Fri, Jul 06, 2012 at 09:33:38AM -0700, Paul E. McKenney wrote:
> > > On Fri, Jul 06, 2012 at 02:00:18PM +0200, Frederic Weisbecker wrote:
> > > > --- a/arch/x86/Kconfig
> > > > +++ b/arch/x86/Kconfig
> > > > @@ -95,6 +95,7 @@ config X86
> > > >  	select KTIME_SCALAR if X86_32
> > > >  	select GENERIC_STRNCPY_FROM_USER
> > > >  	select GENERIC_STRNLEN_USER
> > > > +	select HAVE_RCU_USER_QS if X86_64
> > > 
> > > And I will bite yet again.  Why only 64-bit kernels?
> > 
> > Because HAVE_RCU_USER_QS requires an architecture-specific component,
> > and this patch series only added the necessary bits to entry_64.S.
> 
> OK, please allow me to rephrase the question.  Why only entry_64.S?  ;-)

So like I said, I prefer to wait for reviews and general opinion before
pushing further.