From: Justin Pettit <jpettit@nicira.com>
Date: Wed, 21 Apr 2010 05:42:35 +0000 (-0700)
Subject: datapath: Define kmemdup() for kernels older than 2.6.19
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea32310720d9d07eeb668e404a5062bd9bce832d;p=openvswitch

datapath: Define kmemdup() for kernels older than 2.6.19

The new GRE code requires the kmemdup function, but it's not available
on 2.6.18 kernels.  It has been backported to Xen, so only define it for
non-Xen kernels older than 2.6.19.
---

diff --git a/acinclude.m4 b/acinclude.m4
index 23097b2e..64384d90 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -162,6 +162,8 @@ AC_DEFUN([OVS_CHECK_LINUX26_COMPAT], [
                   [OVS_DEFINE([HAVE_NLA_GET_BE16])])
   OVS_GREP_IFELSE([$KSRC26/include/linux/in.h], [ipv4_is_multicast],
                   [OVS_DEFINE([HAVE_IPV4_IS_MULTICAST])])
+  OVS_GREP_IFELSE([$KSRC26/include/linux/string.h $KSRC26/include/linux/slab.h],
+                  [kmemdup], [OVS_DEFINE([HAVE_KMEMDUP])])
   # Check for the proto_data_valid member in struct sk_buff.  The [^@]
   # is necessary because some versions of this header remove the
   # member but retain the kerneldoc comment that describes it (which
diff --git a/datapath/linux-2.6/Modules.mk b/datapath/linux-2.6/Modules.mk
index 1e22a088..75e885c1 100644
--- a/datapath/linux-2.6/Modules.mk
+++ b/datapath/linux-2.6/Modules.mk
@@ -3,6 +3,7 @@ openvswitch_sources += \
 	linux-2.6/compat-2.6/dev-openvswitch.c \
 	linux-2.6/compat-2.6/genetlink-openvswitch.c \
 	linux-2.6/compat-2.6/ip_output-openvswitch.c \
+	linux-2.6/compat-2.6/kmemdup.c \
 	linux-2.6/compat-2.6/random32.c \
 	linux-2.6/compat-2.6/skbuff-openvswitch.c
 openvswitch_headers += \
@@ -34,6 +35,7 @@ openvswitch_headers += \
 	linux-2.6/compat-2.6/include/linux/rculist.h \
 	linux-2.6/compat-2.6/include/linux/rtnetlink.h \
 	linux-2.6/compat-2.6/include/linux/skbuff.h \
+	linux-2.6/compat-2.6/include/linux/slab.h \
 	linux-2.6/compat-2.6/include/linux/tcp.h \
 	linux-2.6/compat-2.6/include/linux/timer.h \
 	linux-2.6/compat-2.6/include/linux/types.h \
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/slab.h b/datapath/linux-2.6/compat-2.6/include/linux/slab.h
new file mode 100644
index 00000000..5c54c18a
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/include/linux/slab.h
@@ -0,0 +1,10 @@
+#ifndef __LINUX_SLAB_WRAPPER_H
+#define __LINUX_SLAB_WRAPPER_H 1
+
+#include_next <linux/slab.h>
+
+#ifndef HAVE_KMEMDUP
+extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
+#endif
+
+#endif
diff --git a/datapath/linux-2.6/compat-2.6/kmemdup.c b/datapath/linux-2.6/compat-2.6/kmemdup.c
new file mode 100644
index 00000000..b5188fdb
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/kmemdup.c
@@ -0,0 +1,22 @@
+#ifndef HAVE_KMEMDUP
+
+#include <linux/slab.h>
+#include <linux/string.h>
+
+/**
+ * kmemdup - duplicate region of memory
+ *
+ * @src: memory region to duplicate
+ * @len: memory region length
+ * @gfp: GFP mask to use
+ */
+void *kmemdup(const void *src, size_t len, gfp_t gfp)
+{
+	void *p;
+
+	p = kmalloc(len, gfp);
+	if (p)
+		memcpy(p, src, len);
+	return p;
+}
+#endif