mm/sl[uo]b: export __kmalloc_track(_node)_caller

slab does this already, and I want to use this in a memory allocation
tracker in drm for stuff that's tied to the lifetime of a drm_device,
not the underlying struct device. Kinda like devres, but for drm.
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-2-daniel.vetter@ffwll.ch

mm/slob.c

@@ -524,6 +524,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
 {
 	return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
 }
+EXPORT_SYMBOL(__kmalloc_track_caller);
 
 #ifdef CONFIG_NUMA
 void *__kmalloc_node_track_caller(size_t size, gfp_t gfp,
@@ -531,6 +532,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfp,
 {
 	return __do_kmalloc_node(size, gfp, node, caller);
 }
+EXPORT_SYMBOL(__kmalloc_node_track_caller);
 #endif
 
 void kfree(const void *block)

mm/slub.c

@@ -4358,6 +4358,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
 
 	return ret;
 }
+EXPORT_SYMBOL(__kmalloc_track_caller);
 
 #ifdef CONFIG_NUMA
 void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
@@ -4388,6 +4389,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
 
 	return ret;
 }
+EXPORT_SYMBOL(__kmalloc_node_track_caller);
 #endif
 
 #ifdef CONFIG_SYSFS