linux-kernel - Re: [PATCH peterz-queue:locking/core 1/2] locking/rwsem: Fix building with opt spinning and new osq

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Date:	Fri, 11 Jul 2014 14:13:35 -0700
From:	Jason Low <jason.low2@...com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...nel.org, aswin@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH peterz-queue:locking/core 1/2] locking/rwsem: Fix
 building with opt spinning and new osq_lock header

On Fri, 2014-07-11 at 14:00 -0700, Davidlohr Bueso wrote:
> Commit 'rwsem: Reduce the size of struct rw_semaphore' broke all
> DECLARE_RWSEM users, ie:
> 
> init/init_task.c:14:44: error: ‘OSQ_UNLOCKED_VA’ undeclared here (not in a function)
> 
> Signed-off-by: Davidlohr Bueso <davidlohr@...com>
> ---
>  include/linux/rwsem.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
> index 0eff99c..5d40884 100644
> --- a/include/linux/rwsem.h
> +++ b/include/linux/rwsem.h
> @@ -64,7 +64,7 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
>  #endif
>  
>  #if defined(CONFIG_SMP) && !defined(CONFIG_RWSEM_GENERIC_SPINLOCK)
> -#define __RWSEM_OPT_INIT(lockname)	, .owner = NULL, .osq = { ATOMIC_INIT(OQS_UNLOCKED_VAL) }
> +#define __RWSEM_OPT_INIT(lockname)	, .owner = NULL, .osq = { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }

Hi David, I'll be sending out a v2 patchset which address Steven's
feedback (which includes using a macro instead of directly initializing
the osq field).

Thanks!


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