linux-kernel - Re: [PATCH 1/2] locking/rwsem: Add CONFIG_RWSEM_SPIN_ON

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Date:	Fri, 06 Jun 2014 10:13:08 -0700
From:	Jason Low <jason.low2@...com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	peterz@...radead.org, mingo@...nel.org, mpatocka@...hat.com,
	torvalds@...ux-foundation.org, waiman.long@...com,
	jejb@...isc-linux.org, paulmck@...ux.vnet.ibm.com,
	dave.anglin@...l.net, aswin@...com, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH 1/2] locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER

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@...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?


Besides that:

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


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