linux-kernel - Re: [PATCH 1/2] klist: implement KLIST_INIT() and DEFINE

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Message-Id: <1208869049.7115.254.camel@twins>
Date:	Tue, 22 Apr 2008 14:57:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, oliver@...kum.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>, zaitcev@...hat.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/2] klist: implement KLIST_INIT() and DEFINE_KLIST()

On Tue, 2008-04-22 at 18:57 +0900, Tejun Heo wrote:
> klist is missing static initializers and definition helper.  Add them.
> 
> Signed-off-by: Tejun Heo <htejun@...il.com>
> ---
> I can't tell who's in charge of this code, so I'm including last two
> people who made changes and Andrew :-) This will be used by later USB
> mode switch support, so I'm cc'ing USB people too.
> 
> Thanks.
> 
>  include/linux/klist.h |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/klist.h b/include/linux/klist.h
> index 7407125..c6b697c 100644
> --- a/include/linux/klist.h
> +++ b/include/linux/klist.h
> @@ -25,6 +25,14 @@ struct klist {
>  	void			(*put)(struct klist_node *);
>  };
>  
> +#define KLIST_INIT(_name, _get, _put)					\
> +	{ .k_lock	= __SPIN_LOCK_UNLOCKED(klist.k_lock),		\

May I ask you make that: __SPIN_LOCK_UNLOCKED(_name.k_lock)

Otherwise we'll end up with multiple classes that have the same name.

> +	  .k_list	= LIST_HEAD_INIT(_name.k_list),			\
> +	  .get		= _get,						\
> +	  .put		= _put, }
> +
> +#define DEFINE_KLIST(_name, _get, _put)					\
> +	struct klist _name = KLIST_INIT(_name, _get, _put)
>  
>  extern void klist_init(struct klist * k, void (*get)(struct klist_node *),
>  		       void (*put)(struct klist_node *));

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