From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Sep 2012 16:21:08 +0200
Subject: net: Another local_irq_disable/kmalloc headache

Replace it by a local lock. Though that's pretty inefficient :(

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 net/core/skbuff.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -63,6 +63,7 @@
 #include <linux/errqueue.h>
 #include <linux/prefetch.h>
 #include <linux/if_vlan.h>
+#include <linux/locallock.h>
 
 #include <net/protocol.h>
 #include <net/dst.h>
@@ -356,6 +357,7 @@ struct netdev_alloc_cache {
 };
 static DEFINE_PER_CPU(struct netdev_alloc_cache, netdev_alloc_cache);
 static DEFINE_PER_CPU(struct netdev_alloc_cache, napi_alloc_cache);
+static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
 
 static struct page *__page_frag_refill(struct netdev_alloc_cache *nc,
 				       gfp_t gfp_mask)
@@ -433,9 +435,9 @@ static void *__netdev_alloc_frag(unsigne
 	unsigned long flags;
 	void *data;
 
-	local_irq_save(flags);
+	local_lock_irqsave(netdev_alloc_lock, flags);
 	data = __alloc_page_frag(&netdev_alloc_cache, fragsz, gfp_mask);
-	local_irq_restore(flags);
+	local_unlock_irqrestore(netdev_alloc_lock, flags);
 	return data;
 }