linux-kernel - Re: [PATCH 0/1] Recurse when searching for empty slots in resources trees

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Date:	Wed, 17 Jun 2009 03:19:04 +0000
From:	Andrew Patterson <andrew.patterson@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-pci@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jbarnes@...tuousgeek.org,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH 0/1] Recurse when searching for empty slots in
 resources trees

On Tue, 2009-06-16 at 18:04 -0700, Linus Torvalds wrote:
> 
> On Tue, 16 Jun 2009, Linus Torvalds wrote:
> > 
> > Can you try this patch?
> 

This looks functionally equivalent to the current code.  I get way too
much output to be useful.  I can log the serial port if we need it all,
or I can change it to just look at the buses in question if desired. 

My hardware got changed around on me, so I will have to try this
tomorrow with the original hardware config.

Andrew


> Oops. As Jesse pointed out, there was no patch.
> 
> _This_ time.
> 
> 		Linus
> 
> ---
>  kernel/resource.c |   13 ++++++++++---
>  1 files changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/resource.c b/kernel/resource.c
> index ac5f3a3..d9d7ede 100644
> --- a/kernel/resource.c
> +++ b/kernel/resource.c
> @@ -140,6 +140,13 @@ __initcall(ioresources_init);
>  
>  #endif /* CONFIG_PROC_FS */
>  
> +#define set_parent(x,p) __set_parent(__FUNCTION__, x, p)
> +static void __set_parent(const char *fn, struct resource *x, struct resource *parent)
> +{
> +	WARN("%s: parent of '%s' is '%s'\n", fn, x->name, parent ? parent->name : "none");
> +	x->parent = parent;
> +}
> +
>  /* Return the conflict entry if you can't request it */
>  static struct resource * __request_resource(struct resource *root, struct resource *new)
>  {
> @@ -159,7 +166,7 @@ static struct resource * __request_resource(struct resource *root, struct resour
>  		if (!tmp || tmp->start > end) {
>  			new->sibling = tmp;
>  			*p = new;
> -			new->parent = root;
> +			set_parent(new, root);
>  			return NULL;
>  		}
>  		p = &tmp->sibling;
> @@ -395,13 +402,13 @@ static struct resource * __insert_resource(struct resource *parent, struct resou
>  			break;
>  	}
>  
> -	new->parent = parent;
> +	set_parent(new, parent);
>  	new->sibling = next->sibling;
>  	new->child = first;
>  
>  	next->sibling = NULL;
>  	for (next = first; next; next = next->sibling)
> -		next->parent = new;
> +		set_parent(next, new);
>  
>  	if (parent->child == first) {
>  		parent->child = new;
> 
-- 
Andrew Patterson
Hewlett-Packard

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