vmalloc: add __get_vm_area_caller()

We have get_vm_area_caller() and __get_vm_area() but not
__get_vm_area_caller()

On powerpc, I use __get_vm_area() to separate the ranges of addresses
given to vmalloc vs.  ioremap (various good reasons for that) so in order
to be able to implement the new caller tracking in /proc/vmallocinfo, I
need a "_caller" variant of it.

(akpm: needed for ongoing powerpc development, so merge it early)

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 506e762..9c0890c 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -84,6 +84,10 @@
 					unsigned long flags, void *caller);
 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 					unsigned long start, unsigned long end);
+extern struct vm_struct *__get_vm_area_caller(unsigned long size,
+					unsigned long flags,
+					unsigned long start, unsigned long end,
+					void *caller);
 extern struct vm_struct *get_vm_area_node(unsigned long size,
 					  unsigned long flags, int node,
 					  gfp_t gfp_mask);