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

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Message-ID: <alpine.LFD.2.01.0906161804030.16802@localhost.localdomain>
Date:	Tue, 16 Jun 2009 18:04:51 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrew Patterson <andrew.patterson@...com>
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, 16 Jun 2009, Linus Torvalds wrote:
> 
> Can you try this patch?

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;
--
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