linux-kernel - Re: [PATCH 6/6] x86: Exit RCU extended QS on notify resume

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Message-ID: <20120708211707.GG2522@linux.vnet.ibm.com>
Date:	Sun, 8 Jul 2012 14:17:07 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 6/6] x86: Exit RCU extended QS on notify resume

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?  ;-)

							Thanx, Paul

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