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From: Davidlohr Bueso <davidlohr@hp.com>
To: Jason Low <jason.low2@hp.com>
Cc: peterz@infradead.org, mingo@kernel.org, mpatocka@redhat.com,
	torvalds@linux-foundation.org, waiman.long@hp.com,
	jejb@parisc-linux.org, paulmck@linux.vnet.ibm.com,
	dave.anglin@bell.net, aswin@hp.com, linux-kernel@vger.kernel.org,
	linux-parisc@vger.kernel.org
Subject: Re: [PATCH 1/2] locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER
Date: Fri, 06 Jun 2014 11:12:38 -0700	[thread overview]
Message-ID: <1402078358.14433.3.camel@buesod1.americas.hpqcorp.net> (raw)
In-Reply-To: <1402074788.6680.50.camel@j-VirtualBox>

On Fri, 2014-06-06 at 10:13 -0700, Jason Low wrote:
> On Fri, 2014-06-06 at 08:55 -0700, Davidlohr Bueso wrote:
> > Just like with mutexes (CONFIG_MUTEX_SPIN_ON_OWNER),
> > encapsulate the dependencies for rwsem optimistic spinning.
> > No logical changes here as it continues to depend on both
> > SMP and the XADD algorithm variant.
> > 
> > Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
> > ---
> >  include/linux/rwsem.h  | 4 ++--
> >  kernel/Kconfig.locks   | 4 ++++
> >  kernel/locking/rwsem.c | 2 +-
> >  3 files changed, 7 insertions(+), 3 deletions(-)
> 
> Do we also want to add an #ifdef CONFIG_RWSEM_SPIN_ON_OWNER in
> __init_rwsem() and in the optimistic spinning functions for rwsem-xadd?
> 

Not really, as we conditionally build rwsem-xadd.o based on
CONFIG_RWSEM_XCHGADD_ALGORITHM:

obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o

So leaving just SMP is ok there.

> 
> Besides that:
> 
> Acked-by: Jason Low <jason.low2@hp.com>
> 

Thanks,
Davidlohr

  reply	other threads:[~2014-06-06 18:12 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-06 15:55 [PATCH 0/2] locking/rwsem: disable optimistic spinning for PA-RISC Davidlohr Bueso
2014-06-06 15:55 ` [PATCH 1/2] locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER Davidlohr Bueso
2014-06-06 17:13   ` Jason Low
2014-06-06 18:12     ` Davidlohr Bueso [this message]
2014-06-06 18:48       ` Davidlohr Bueso
2014-06-06 19:08         ` Jason Low
2014-06-06 19:20           ` Davidlohr Bueso
2014-06-06 15:55 ` [PATCH 2/2] locking/rwsem: Disable optimistic spinning for PA-RISC Davidlohr Bueso
2014-06-06 16:09   ` James Bottomley
2014-06-06 17:11     ` Peter Zijlstra
2014-06-06 17:19       ` Chris Metcalf
2014-06-06 17:22       ` Linus Torvalds
2014-06-06 17:53         ` Peter Zijlstra
2014-06-06 17:57           ` James Bottomley
2014-06-06 17:58             ` James Bottomley
2014-06-06 18:01             ` Peter Zijlstra

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