linux-kernel - [PATCH 4/8] lib: Add prototype declarations in lib/clz

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Date:	Tue, 25 Feb 2014 13:16:15 +0530
From:	Rashika Kheria <rashika.kheria@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rashika Kheria <rashika.kheria@...il.com>,
	Chanho Min <chanho.min@....com>, josh@...htriplett.org
Subject: [PATCH 4/8] lib: Add prototype declarations in lib/clz_ctz.c

Add prototype declarations of functions in lib/clz_ctz.c. These
functions are required by GCC builtins and hence can not be removed
despite of their unreferenced appearance in kernel source.

This eliminates the following warning in lib/clz_ctz.c:
lib/clz_ctz.c:16:12: warning: no previous prototype for ‘__ctzsi2’ [-Wmissing-prototypes]
lib/clz_ctz.c:22:12: warning: no previous prototype for ‘__clzsi2’ [-Wmissing-prototypes]
lib/clz_ctz.c:44:12: warning: no previous prototype for ‘__clzdi2’ [-Wmissing-prototypes]
lib/clz_ctz.c:50:12: warning: no previous prototype for ‘__ctzdi2’ [-Wmissing-prototypes]

Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
 lib/clz_ctz.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/clz_ctz.c b/lib/clz_ctz.c
index a8f8379..2e11e48 100644
--- a/lib/clz_ctz.c
+++ b/lib/clz_ctz.c
@@ -6,6 +6,9 @@
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
+ * The functions in this file aren't called directly, but are required by
+ * GCC builtins such as __builtin_ctz, and therefore they can't be removed
+ * despite appearing unreferenced in kernel source.
  *
  * __c[lt]z[sd]i2 can be overridden by linking arch-specific versions.
  */
@@ -13,18 +16,22 @@
 #include <linux/export.h>
 #include <linux/kernel.h>
 
+int __weak __ctzsi2(int val);
 int __weak __ctzsi2(int val)
 {
 	return __ffs(val);
 }
 EXPORT_SYMBOL(__ctzsi2);
 
+int __weak __clzsi2(int val);
 int __weak __clzsi2(int val)
 {
 	return 32 - fls(val);
 }
 EXPORT_SYMBOL(__clzsi2);
 
+int __weak __clzdi2(long val);
+int __weak __ctzdi2(long val);
 #if BITS_PER_LONG == 32
 
 int __weak __clzdi2(long val)
-- 
1.7.9.5

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