kmemleak: Add support for NO_BOOTMEM configurations

With commits 08677214 and 59be5a8e, alloc_bootmem()/free_bootmem() and
friends use the early_res functions for memory management when
NO_BOOTMEM is enabled. This patch adds the kmemleak calls in the
corresponding code paths for bootmem allocations.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Acked-by: NPekka Enberg <penberg@cs.helsinki.fi>
Acked-by: NYinghai Lu <yinghai@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: stable@kernel.org

kernel/early_res.c

@@ -7,6 +7,8 @@
 #include <linux/bootmem.h>
 #include <linux/mm.h>
 #include <linux/early_res.h>
+#include <linux/slab.h>
+#include <linux/kmemleak.h>
 
 /*
  * Early reserved memory areas.
@@ -319,6 +321,8 @@ void __init free_early(u64 start, u64 end)
 	struct early_res *r;
 	int i;
 
+	kmemleak_free_part(__va(start), end - start);
+
 	i = find_overlapped_early(start, end);
 	r = &early_res[i];
 	if (i >= max_early_res || r->end != end || r->start != start)
@@ -333,6 +337,8 @@ void __init free_early_partial(u64 start, u64 end)
 	struct early_res *r;
 	int i;
 
+	kmemleak_free_part(__va(start), end - start);
+
 	if (start == end)
 		return;
 

mm/page_alloc.c

@@ -3659,6 +3659,11 @@ void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
 		ptr = phys_to_virt(addr);
 		memset(ptr, 0, size);
 		reserve_early_without_check(addr, addr + size, "BOOTMEM");
+		/*
+		 * The min_count is set to 0 so that bootmem allocated blocks
+		 * are never reported as leaks.
+		 */
+		kmemleak_alloc(ptr, size, 0, 0);
 		return ptr;
 	}