d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* lib/clz_ctz.c
|
|
*
|
|
* Copyright (C) 2013 Chanho Min <chanho.min@lge.com>
|
|
*
|
|
* 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
|