From f0e36f8cee8101604378085171c980d9cc71d779 Mon Sep 17 00:00:00 2001
From: Patrick McHardy <kaber@trash.net>
Date: Tue, 5 Jul 2005 14:44:55 -0700
Subject: [PATCH] [IPV4]: Handle large allocations in fib_trie

Inflating a node a couple of times makes it exceed the 128k kmalloc limit.
Use __get_free_pages for allocations > PAGE_SIZE, as in fib_hash.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Robert Olsson <Robert.Olsson@data.slu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/fib_trie.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index b56e88edf1b3..9038b914b4b1 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -358,11 +358,32 @@ static inline void free_leaf_info(struct leaf_info *li)
 	kfree(li);
 }
 
+static struct tnode *tnode_alloc(unsigned int size)
+{
+	if (size <= PAGE_SIZE) {
+		return kmalloc(size, GFP_KERNEL);
+	} else {
+		return (struct tnode *)
+		       __get_free_pages(GFP_KERNEL, get_order(size));
+	}
+}
+
+static void __tnode_free(struct tnode *tn)
+{
+	unsigned int size = sizeof(struct tnode) +
+	                    (1<<tn->bits) * sizeof(struct node *);
+
+	if (size <= PAGE_SIZE)
+		kfree(tn);
+	else
+		free_pages((unsigned long)tn, get_order(size));
+}
+
 static struct tnode* tnode_new(t_key key, int pos, int bits)
 {
 	int nchildren = 1<<bits;
 	int sz = sizeof(struct tnode) + nchildren * sizeof(struct node *);
-	struct tnode *tn = kmalloc(sz,  GFP_KERNEL);
+	struct tnode *tn = tnode_alloc(sz);
 
 	if(tn)  {
 		memset(tn, 0, sz);
@@ -390,7 +411,7 @@ static void tnode_free(struct tnode *tn)
 			printk("FL %p \n", tn);
 	}
 	else if(IS_TNODE(tn)) { 
-		kfree(tn);
+		__tnode_free(tn);
 		if(trie_debug > 0 ) 
 			printk("FT %p \n", tn);
 	}
-- 
2.20.1