mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
3c516cdd02
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>
65 lines
1.3 KiB
C
65 lines
1.3 KiB
C
/*
|
|
* lib/clz_ctz.c
|
|
*
|
|
* Copyright (C) 2013 Chanho Min <chanho.min@lge.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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)
|
|
{
|
|
return 32 - fls((int)val);
|
|
}
|
|
EXPORT_SYMBOL(__clzdi2);
|
|
|
|
int __weak __ctzdi2(long val)
|
|
{
|
|
return __ffs((u32)val);
|
|
}
|
|
EXPORT_SYMBOL(__ctzdi2);
|
|
|
|
#elif BITS_PER_LONG == 64
|
|
|
|
int __weak __clzdi2(long val)
|
|
{
|
|
return 64 - fls64((u64)val);
|
|
}
|
|
EXPORT_SYMBOL(__clzdi2);
|
|
|
|
int __weak __ctzdi2(long val)
|
|
{
|
|
return __ffs64((u64)val);
|
|
}
|
|
EXPORT_SYMBOL(__ctzdi2);
|
|
|
|
#else
|
|
#error BITS_PER_LONG not 32 or 64
|
|
#endif
|