linux-kernel - Re: [PATCH 3/4] gcov: add gcov profiling infrastructure

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Date:	Thu, 26 Feb 2009 20:08:42 +0800
From:	Li Wei <W.Li@....COM>
To:	Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Huang Ying <ying.huang@...el.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 3/4] gcov: add gcov profiling infrastructure

On Thu, 2009-02-26 at 12:46 +0100, Peter Oberparleiter wrote:
> necessary. My proposed fix looks something like this (unless there
> are objections, I'll include this one in the re-post):

I'd prefer a goto. But this looks nice too. Thanks! :)

> ---
>  kernel/gcov/fs.c |   21 ++++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)
> 
> Index: linux-2.6.29-rc6/kernel/gcov/fs.c
> ===================================================================
> --- linux-2.6.29-rc6.orig/kernel/gcov/fs.c
> +++ linux-2.6.29-rc6/kernel/gcov/fs.c
> @@ -453,15 +453,22 @@ static ssize_t reset_write(struct file *
>  			   size_t len, loff_t *pos)
>  {
>  	struct gcov_node *node;
> -	struct gcov_node *r;
> +	int restart;
>  
>  	mutex_lock(&node_lock);
> -	list_for_each_entry_safe(node, r, &all_head, all) {
> -		if (node->info)
> -			gcov_info_reset(node->info);
> -		else
> -			remove_node(node);
> -	}
> +	do {
> +		restart = 0;
> +		list_for_each_entry(node, &all_head, all) {
> +			if (node->info)
> +				gcov_info_reset(node->info);
> +			else if (list_empty(&node->children)) {
> +				remove_node(node);
> +				/* Several nodes may have gone - restart. */
> +				restart = 1;
> +				break;
> +			}
> +		}
> +	} while (restart);
>  	mutex_unlock(&node_lock);
>  
>  	return len;
> 

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