bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem

The vmemmap pages is marked by kmemleak when allocated from memblock. 
Remove it from kmemleak when freeing the page.  Otherwise, when we reuse
the page, kmemleak may report such an error and then stop working.

 kmemleak: Cannot insert 0xffff98fb6eab3d40 into the object search tree (overlaps existing)
 kmemleak: Kernel memory leak detector disabled
 kmemleak: Object 0xffff98fb6be00000 (size 335544320):
 kmemleak:   comm "swapper", pid 0, jiffies 4294892296
 kmemleak:   min_count = 0
 kmemleak:   count = 0
 kmemleak:   flags = 0x1
 kmemleak:   checksum = 0
 kmemleak:   backtrace:

Link: https://lkml.kernel.org/r/[email protected]
Fixes: f41f2ed (mm: hugetlb: free the vmemmap pages associated with each HugeTLB page)
Signed-off-by: Liu Shixin <[email protected]>
Reviewed-by: Muchun Song <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Mike Kravetz <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/bootmem_info.c

@@ -12,6 +12,7 @@
 #include <linux/memblock.h>
 #include <linux/bootmem_info.h>
 #include <linux/memory_hotplug.h>
+#include <linux/kmemleak.h>
 
 void get_page_bootmem(unsigned long info, struct page *page, unsigned long type)
 {
@@ -33,6 +34,7 @@ void put_page_bootmem(struct page *page)
 		ClearPagePrivate(page);
 		set_page_private(page, 0);
 		INIT_LIST_HEAD(&page->lru);
+		kmemleak_free_part(page_to_virt(page), PAGE_SIZE);
 		free_reserved_page(page);
 	}
 }