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-spa...@vger.kernel.org
Cc: Masahiro Yamada <yamada.masah...@socionext.com>
Cc: Michal Marek <michal.l...@markovi.net>
Cc: linux-kbu...@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 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

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