linux-kernel - [PATCH] asm-generic: fix ffs -Wshadow warning

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Date:   Mon, 26 Oct 2020 16:59:59 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] asm-generic: fix ffs -Wshadow warning

From: Arnd Bergmann <arnd@...db.de>

gcc -Wshadow warns about the ffs() definition that has the
same name as the global ffs() built-in:

include/asm-generic/bitops/builtin-ffs.h:13:28: warning: declaration of 'ffs' shadows a built-in function [-Wshadow]

This is annoying because 'make W=2' warns every time this
header gets included.

Change it to use a #define instead, making callers directly
reference the builtin.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/asm-generic/bitops/builtin-ffs.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/asm-generic/bitops/builtin-ffs.h b/include/asm-generic/bitops/builtin-ffs.h
index 458c85ebcd15..1dacfdb4247e 100644
--- a/include/asm-generic/bitops/builtin-ffs.h
+++ b/include/asm-generic/bitops/builtin-ffs.h
@@ -10,9 +10,6 @@
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the above ffz (man ffs).
  */
-static __always_inline int ffs(int x)
-{
-	return __builtin_ffs(x);
-}
+#define ffs(x) __builtin_ffs(x)
 
 #endif
-- 
2.27.0