Commit 3c516cdd authored Apr 03, 2014 by Rashika Kheria Committed by Linus Torvalds Apr 03, 2014

lib/clz_ctz.c: 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@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Chanho Min <chanho.min@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d3d47eb2

lib/clz_ctz.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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)

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