lib: add weak clz/ctz functions

obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \

	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \

	 gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o \

	 gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o clz_ctz.o \

	 bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o

obj-y += string_helpers.o

obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o

/*

 * 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.

 *

 * __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)

{

	return __ffs(val);

}

EXPORT_SYMBOL(__ctzsi2);

int __weak __clzsi2(int val)

{

	return 32 - fls(val);

}

EXPORT_SYMBOL(__clzsi2);

#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