[PATCH 1/3] kbuild: Add -Wshadow to sparse

[Sebastian Andrzej Siewior]

I remember that `sparse' used to warn about shadowed variables but it
seems not to do it by default anymore. It was useful.

Enable `-Wshadow' while invoking sparse.

Cc: linux-sparse@xxxxxxxxxxxxxxx
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Michal Marek <michal.lkml@xxxxxxxxxxx>
Cc: linux-kbuild@xxxxxxxxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index bf3786e4ffece..0160c6b5dd45d 100644
--- a/Makefile
+++ b/Makefile
@@ -390,7 +390,7 @@ PYTHON3		= python3
 CHECK		= sparse
 
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
+		  -Wbitwise -Wno-return-void -Wno-unknown-attribute -Wshadow $(CF)
 NOSTDINC_FLAGS  =
 CFLAGS_MODULE   =
 AFLAGS_MODULE   =
-- 
2.19.1