linux-kernel - Re: [PATCH] SCHED: allow wait_on_bit_action functions to support a timeout.

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Date:	Thu, 1 May 2014 10:04:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH] SCHED: allow wait_on_bit_action functions to support a
 timeout.

On Thu, May 01, 2014 at 12:41:43PM +1000, NeilBrown wrote:
> diff --git a/include/linux/wait.h b/include/linux/wait.h
> index 438dc6044587..162cbcde9dae 100644
> --- a/include/linux/wait.h
> +++ b/include/linux/wait.h
> @@ -25,6 +25,7 @@ struct wait_bit_key {
>  	void			*flags;
>  	int			bit_nr;
>  #define WAIT_ATOMIC_T_BIT_NR	-1
> +	unsigned long		private;
>  };
>  
>  struct wait_bit_queue {
> @@ -147,12 +148,12 @@ void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, void *k
>  void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr);
>  void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
>  void __wake_up_bit(wait_queue_head_t *, void *, int);
> -int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
> -int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
> +int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(struct wait_bit_key *), unsigned);
> +int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(struct wait_bit_key *), unsigned);


Would something like:

typedef int (*wait_bit_action_f)(struct wait_bit_key *);

make sense?
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