From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 2/2] locking/rwsem: Disable optimistic spinning for
 PA-RISC
Date: Fri, 6 Jun 2014 20:01:02 +0200
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Davidlohr Bueso <davidlohr@hp.com>,
	Ingo Molnar <mingo@kernel.org>,
	Mikulas Patocka <mpatocka@redhat.com>,
	Jason Low <jason.low2@hp.com>,
	Waiman Long <waiman.long@hp.com>,
	"James E.J. Bottomley" <jejb@parisc-linux.org>,
	Paul McKenney <paulmck@linux.vnet.ibm.com>,
	John David Anglin <dave.anglin@bell.net>,
	"Chandramouleeswaran, Aswin" <aswin@hp.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Parisc List <linux-parisc@vger.kernel.org>,
	David Miller <davem@davemloft.net>,
	James Hogan <james.hogan@imgtec.com>,
	Chris Metcalf <cmetcalf@tilera.com>,
	Vineet Gupta <vgupta@synopsys.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Return-path: <linux-parisc-owner@vger.kernel.org>
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List-Id: linux-parisc.vger.kernel.org

On Fri, Jun 06, 2014 at 10:57:07AM -0700, James Bottomley wrote:
> > diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> > index 29f2e988c56a..407c87d9879a 100644
> > --- a/arch/sparc/Kconfig
> > +++ b/arch/sparc/Kconfig
> > @@ -78,6 +78,7 @@ config SPARC64
                      ^^^^^^^^^^^^^^


> >  	select HAVE_C_RECORDMCOUNT
> >  	select NO_BOOTMEM
> >  	select HAVE_ARCH_AUDITSYSCALL
> > +	select ARCH_SUPPORTS_ATOMIC_RMW
> 
> Sparc64 does, Sparc32 doesn't, so shouldn't that be
> 
> select ARCH_SUPPORTS_ATOMIC_RMW if 64BIT
> 
> ?

arch/sparc/Kconfig has 3 large sections:

config SPARC (included in both)
config SPARC32 (specific to 32bit)
config SPARC64 (specific to 64bit)

I added it to the last.