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>

include/linux/vmalloc.h

@@ -84,6 +84,10 @@ extern struct vm_struct *get_vm_area_caller(unsigned long size,
 					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);

mm/vmalloc.c

@@ -1106,6 +1106,14 @@ struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 }
 EXPORT_SYMBOL_GPL(__get_vm_area);
 
+struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
+				       unsigned long start, unsigned long end,
+				       void *caller)
+{
+	return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL,
+				  caller);
+}
+
 /**
  *	get_vm_area  -  reserve a contiguous kernel virtual area
  *	@size:		size of the area