Running 'make CC=clang' under tools/testing/memblock, I've
noticed the following:

clang -I. -I../../include -Wall -O2 -fsanitize=address -fsanitize=undefined \
      -D CONFIG_PHYS_ADDR_T_64BIT   -c -o memblock.o memblock.c
memblock.c:783:44: error: use of undeclared identifier 'SZ_1M'
  783 |                 mem_size_mb = memblock_phys_mem_size() / SZ_1M;
      |                                                          ^~~~~
memblock.c:785:37: error: use of undeclared identifier 'SZ_1M'
  785 |                        (nr_pages << PAGE_SHIFT) / SZ_1M, mem_size_mb);
      |                                                   ^~~~~

So just include linux/sizes.h from the linux/kernel.h stub.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
---
 tools/testing/memblock/linux/kernel.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/memblock/linux/kernel.h b/tools/testing/memblock/linux/kernel.h
index 4d1012d5be6e..3401ea867c8f 100644
--- a/tools/testing/memblock/linux/kernel.h
+++ b/tools/testing/memblock/linux/kernel.h
@@ -10,5 +10,6 @@
 #include <linux/kconfig.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
+#include <linux/sizes.h>
 
 #endif
-- 
2.52.0