kernel: fix vmalloc stack traces triggered by module with an empty init section (mostly happens on x86)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30813 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic/patches-3.2/340-module_alloc_size_check.patch

@@ -0,0 +1,20 @@
+--- a/kernel/module.c
++++ b/kernel/module.c
+@@ -2286,12 +2286,15 @@
+ 
+ void * __weak module_alloc(unsigned long size)
+ {
+-	return size == 0 ? NULL : vmalloc_exec(size);
++	return vmalloc_exec(size);
+ }
+ 
+ static void *module_alloc_update_bounds(unsigned long size)
+ {
+-	void *ret = module_alloc(size);
++	void *ret = NULL;
++
++	if (size)
++		ret = module_alloc(size);
+ 
+ 	if (ret) {
+ 		mutex_lock(&module_mutex);

target/linux/generic/patches-3.3/340-module_alloc_size_check.patch

@@ -0,0 +1,20 @@
+--- a/kernel/module.c
++++ b/kernel/module.c
+@@ -2322,12 +2322,15 @@
+ 
+ void * __weak module_alloc(unsigned long size)
+ {
+-	return size == 0 ? NULL : vmalloc_exec(size);
++	return vmalloc_exec(size);
+ }
+ 
+ static void *module_alloc_update_bounds(unsigned long size)
+ {
+-	void *ret = module_alloc(size);
++	void *ret = NULL;
++
++	if (size)
++		ret = module_alloc(size);
+ 
+ 	if (ret) {
+ 		mutex_lock(&module_mutex);