rt-patches/0227-net-Another-local_irq_disable-kmalloc-headache.patch

From 8f39d2470253d89580c7c900023b27805415c812 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Sep 2012 16:21:08 +0200
Subject: [PATCH 227/366] 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(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4968b5d..9d20d9a5 100644
--- 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>
@@ -351,6 +352,7 @@ EXPORT_SYMBOL(build_skb);
 
 static DEFINE_PER_CPU(struct page_frag_cache, netdev_alloc_cache);
 static DEFINE_PER_CPU(struct page_frag_cache, napi_alloc_cache);
+static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
 
 static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
 {
@@ -358,10 +360,10 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
 	unsigned long flags;
 	void *data;
 
-	local_irq_save(flags);
+	local_lock_irqsave(netdev_alloc_lock, flags);
 	nc = this_cpu_ptr(&netdev_alloc_cache);
 	data = __alloc_page_frag(nc, fragsz, gfp_mask);
-	local_irq_restore(flags);
+	local_unlock_irqrestore(netdev_alloc_lock, flags);
 	return data;
 }
 
-- 
1.9.1