linux-kernel - Re: [RFC] ipvs: Cleanup sync daemon code

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Date:	Sat, 9 Feb 2008 23:59:52 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Sven Wegener <sven.wegener@...aler.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] ipvs: Cleanup sync daemon code

On Sun, Feb 10, 2008 at 12:38:11AM +0100, Sven Wegener wrote:
>  struct ip_vs_sync_thread_data {
> -	struct completion *startup;
> +	struct completion *startup; /* set to NULL once completed */

This is not needed anmore.  kthread_run guarantees that the newly
creates thread is run before returning to the caller.

> +/* wait queue for master sync daemon */
> +static DECLARE_WAIT_QUEUE_HEAD(sync_master_wait);

I don't think you need this one either.  You can use wake_up_process
on the task_struct pointer instead.

>  	spin_lock(&ip_vs_sync_lock);
>  	list_add_tail(&sb->list, &ip_vs_sync_queue);
> +	if (++ip_vs_sync_count == 10)
> +		wake_up_interruptible(&sync_master_wait);
>  	spin_unlock(&ip_vs_sync_lock);
>  }

> -static int sync_thread(void *startup)
> +static int sync_thread(void *data)

Btw, it might make sense to remove sync_thread and just call the
master and backup threads directly.
> +void __init ip_vs_sync_init(void)
> +{
> +	/* set up multicast address */
> +	mcast_addr.sin_family = AF_INET;
> +	mcast_addr.sin_port = htons(IP_VS_SYNC_PORT);
> +	mcast_addr.sin_addr.s_addr = htonl(IP_VS_SYNC_GROUP);
>  }

Why can't this be initialized at compile time by:

static struct sockaddr_in mcast_addr = {
	.sin_family		= AF_INET,
	.sin_port		= htons(IP_VS_SYNC_PORT),
	.sin_addr.s_addr	= htonl(IP_VS_SYNC_GROUP),
}

(the hton* might need __constant_hton* also I'm not sure without trying)

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