linux-kernel - Re: [3/10 PATCH] inline wake_up

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Date:	Wed, 25 Jun 2008 16:17:40 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [3/10 PATCH] inline wake_up_bit

On Tuesday 24 June 2008 07:57, Mikulas Patocka wrote:
> Inline wake_up_bit. The function just pases arguments around.
> 
> Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
> 
>   int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
> -void wake_up_bit(void *, int);
>   int out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned);

> +static __always_inline void wake_up_bit(void *word, int bit)
> +{
> +	__wake_up_bit(bit_waitqueue(word, bit), word, bit);
> +}

So now every call to wake_up_bit(word, bit) now is converted to:

__wake_up_bit(bit_waitqueue(word, bit), word, bit);

which is in turn converted to (looking into your next patch):

{
       wait_queue_head_t *wq = bit_waitqueue(word, bit);
       struct wait_bit_key key = __WAIT_BIT_KEY_INITIALIZER(word, bit);
       if (waitqueue_active(wq))
               __wake_up(wq, TASK_NORMAL, 1, &key);
}

which is in turn converted to (looking into your other patch):

{
       wait_queue_head_t *wq = bit_waitqueue(word, bit);
       struct wait_bit_key key = __WAIT_BIT_KEY_INITIALIZER(word, bit);
       if (waitqueue_active(wq))
               {
                      unsigned long flags;
                      spin_lock_irqsave(&qw->lock, flags);
                      __wake_up_common(wq, TASK_NORMAL, 1, 0, &key);
                      spin_unlock_irqrestore(&wq->lock, flags);
               }
}

And you know what? This is likely not the end yet! It's possible
spin_lock_irqXXX, __wake_up_common, waitqueue_active or bit_waitqueue
are inlines - I didn't check.
--
vda
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