linux-kernel - Re: [Patch] Convert max_user

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Date:	Sun, 10 Oct 2010 21:49:58 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Robin Holt <holt@....com>
cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] Convert max_user_watches to long.

On Sat, 9 Oct 2010, Robin Holt wrote:

> @@ -900,11 +902,12 @@ static int ep_insert(struct eventpoll *e
>  {
>  	int error, revents, pwake = 0;
>  	unsigned long flags;
> +	long user_watches;
>  	struct epitem *epi;
>  	struct ep_pqueue epq;
>  
> -	if (unlikely(atomic_read(&ep->user->epoll_watches) >=
> -		     max_user_watches))
> +	user_watches = atomic_long_read(&ep->user->epoll_watches);
> +	if (user_watches >= max_user_watches)
>  		return -ENOSPC;

Is there a particular reason for adding an extra, otherwise unused, 
user_watches variable?


- Davide


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