include/asm-x86_64/bitops.h - pub/scm/linux/kernel/git/horms/ipvs-next - Git at Google

 #ifndef _X86_64_BITOPS_H
 #define _X86_64_BITOPS_H

 /*
  * Copyright 1992, Linus Torvalds.
  */

 #include <linux/config.h>

 #ifdef CONFIG_SMP
 #define LOCK_PREFIX "lock ; "
 #else
 #define LOCK_PREFIX ""
 #endif

 #define ADDR (*(volatile long *) addr)

 /**
  * set_bit - Atomically set a bit in memory
  * @nr: the bit to set
  * @addr: the address to start counting from
  *
  * This function is atomic and may not be reordered.  See __set_bit()
  * if you do not require the atomic guarantees.
  * Note that @nr may be almost arbitrarily large; this function is not
  * restricted to acting on a single-word quantity.
  */
 static __inline__ void set_bit(int nr, volatile void * addr)
 {
 	__asm__ __volatile__( LOCK_PREFIX
 		"btsl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 }

 /**
  * __set_bit - Set a bit in memory
  * @nr: the bit to set
  * @addr: the address to start counting from
  *
  * Unlike set_bit(), this function is non-atomic and may be reordered.
  * If it's called on the same region of memory simultaneously, the effect
  * may be that only one operation succeeds.
  */
 static __inline__ void __set_bit(int nr, volatile void * addr)
 {
 	__asm__ volatile(
 		"btsl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 }

 /**
  * clear_bit - Clears a bit in memory
  * @nr: Bit to clear
  * @addr: Address to start counting from
  *
  * clear_bit() is atomic and may not be reordered.  However, it does
  * not contain a memory barrier, so if it is used for locking purposes,
  * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
  * in order to ensure changes are visible on other processors.
  */
 static __inline__ void clear_bit(int nr, volatile void * addr)
 {
 	__asm__ __volatile__( LOCK_PREFIX
 		"btrl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr));
 }

 static __inline__ void __clear_bit(int nr, volatile void * addr)
 {
 	__asm__ __volatile__(
 		"btrl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr));
 }

 #define smp_mb__before_clear_bit()	barrier()
 #define smp_mb__after_clear_bit()	barrier()

 /**
  * __change_bit - Toggle a bit in memory
  * @nr: the bit to change
  * @addr: the address to start counting from
  *
  * Unlike change_bit(), this function is non-atomic and may be reordered.
  * If it's called on the same region of memory simultaneously, the effect
  * may be that only one operation succeeds.
  */
 static __inline__ void __change_bit(int nr, volatile void * addr)
 {
 	__asm__ __volatile__(
 		"btcl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr));
 }

 /**
  * change_bit - Toggle a bit in memory
  * @nr: Bit to change
  * @addr: Address to start counting from
  *
  * change_bit() is atomic and may not be reordered.
  * Note that @nr may be almost arbitrarily large; this function is not
  * restricted to acting on a single-word quantity.
  */
 static __inline__ void change_bit(int nr, volatile void * addr)
 {
 	__asm__ __volatile__( LOCK_PREFIX
 		"btcl %1,%0"
 		:"+m" (ADDR)
 		:"dIr" (nr));
 }

 /**
  * test_and_set_bit - Set a bit and return its old value
  * @nr: Bit to set
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static __inline__ int test_and_set_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__ __volatile__( LOCK_PREFIX
 		"btsl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 	return oldbit;
 }

 /**
  * __test_and_set_bit - Set a bit and return its old value
  * @nr: Bit to set
  * @addr: Address to count from
  *
  * This operation is non-atomic and can be reordered.
  * If two examples of this operation race, one can appear to succeed
  * but actually fail.  You must protect multiple accesses with a lock.
  */
 static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__(
 		"btsl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr));
 	return oldbit;
 }

 /**
  * test_and_clear_bit - Clear a bit and return its old value
  * @nr: Bit to clear
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__ __volatile__( LOCK_PREFIX
 		"btrl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 	return oldbit;
 }

 /**
  * __test_and_clear_bit - Clear a bit and return its old value
  * @nr: Bit to clear
  * @addr: Address to count from
  *
  * This operation is non-atomic and can be reordered.
  * If two examples of this operation race, one can appear to succeed
  * but actually fail.  You must protect multiple accesses with a lock.
  */
 static __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__(
 		"btrl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr));
 	return oldbit;
 }

 /* WARNING: non atomic and it can be reordered! */
 static __inline__ int __test_and_change_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__ __volatile__(
 		"btcl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 	return oldbit;
 }

 /**
  * test_and_change_bit - Change a bit and return its old value
  * @nr: Bit to change
  * @addr: Address to count from
  *
  * This operation is atomic and cannot be reordered.
  * It also implies a memory barrier.
  */
 static __inline__ int test_and_change_bit(int nr, volatile void * addr)
 {
 	int oldbit;

 	__asm__ __volatile__( LOCK_PREFIX
 		"btcl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit),"+m" (ADDR)
 		:"dIr" (nr) : "memory");
 	return oldbit;
 }

 #if 0 /* Fool kernel-doc since it doesn't do macros yet */
 /**
  * test_bit - Determine whether a bit is set
  * @nr: bit number to test
  * @addr: Address to start counting from
  */
 static int test_bit(int nr, const volatile void * addr);
 #endif

 static __inline__ int constant_test_bit(int nr, const volatile void * addr)
 {
 	return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
 }

 static __inline__ int variable_test_bit(int nr, volatile const void * addr)
 {
 	int oldbit;

 	__asm__ __volatile__(
 		"btl %2,%1\n\tsbbl %0,%0"
 		:"=r" (oldbit)
 		:"m" (ADDR),"dIr" (nr));
 	return oldbit;
 }

 #define test_bit(nr,addr) \
 (__builtin_constant_p(nr) ? \
  constant_test_bit((nr),(addr)) : \
  variable_test_bit((nr),(addr)))

 #undef ADDR

 extern long find_first_zero_bit(const unsigned long * addr, unsigned long size);
 extern long find_next_zero_bit (const unsigned long * addr, long size, long offset);
 extern long find_first_bit(const unsigned long * addr, unsigned long size);
 extern long find_next_bit(const unsigned long * addr, long size, long offset);

 /* return index of first bet set in val or max when no bit is set */
 static inline unsigned long __scanbit(unsigned long val, unsigned long max)
 {
 	asm("bsfq %1,%0 ; cmovz %2,%0" : "=&r" (val) : "r" (val), "r" (max));
 	return val;
 }

 #define find_first_bit(addr,size) \
 ((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
   (__scanbit(*(unsigned long *)addr,(size))) : \
   find_first_bit(addr,size)))

 #define find_next_bit(addr,size,off) \
 ((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? 	  \
   ((off) + (__scanbit((*(unsigned long *)addr) >> (off),(size)-(off)))) : \
 	find_next_bit(addr,size,off)))

 #define find_first_zero_bit(addr,size) \
 ((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
   (__scanbit(~*(unsigned long *)addr,(size))) : \
   	find_first_zero_bit(addr,size)))

 #define find_next_zero_bit(addr,size,off) \
 ((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? 	  \
   ((off)+(__scanbit(~(((*(unsigned long *)addr)) >> (off)),(size)-(off)))) : \
 	find_next_zero_bit(addr,size,off)))

 /*
  * Find string of zero bits in a bitmap. -1 when not found.
  */
 extern unsigned long
 find_next_zero_string(unsigned long *bitmap, long start, long nbits, int len);

 static inline void set_bit_string(unsigned long *bitmap, unsigned long i,
 				  int len)
 {
 	unsigned long end = i + len;
 	while (i < end) {
 		__set_bit(i, bitmap);
 		i++;
 	}
 }

 static inline void __clear_bit_string(unsigned long *bitmap, unsigned long i,
 				    int len)
 {
 	unsigned long end = i + len;
 	while (i < end) {
 		__clear_bit(i, bitmap);
 		i++;
 	}
 }

 /**
  * ffz - find first zero in word.
  * @word: The word to search
  *
  * Undefined if no zero exists, so code should check against ~0UL first.
  */
 static __inline__ unsigned long ffz(unsigned long word)
 {
 	__asm__("bsfq %1,%0"
 		:"=r" (word)
 		:"r" (~word));
 	return word;
 }

 /**
  * __ffs - find first bit in word.
  * @word: The word to search
  *
  * Undefined if no bit exists, so code should check against 0 first.
  */
 static __inline__ unsigned long __ffs(unsigned long word)
 {
 	__asm__("bsfq %1,%0"
 		:"=r" (word)
 		:"rm" (word));
 	return word;
 }

 /*
  * __fls: find last bit set.
  * @word: The word to search
  *
  * Undefined if no zero exists, so code should check against ~0UL first.
  */
 static __inline__ unsigned long __fls(unsigned long word)
 {
 	__asm__("bsrq %1,%0"
 		:"=r" (word)
 		:"rm" (word));
 	return word;
 }

 #ifdef __KERNEL__

 static inline int sched_find_first_bit(const unsigned long *b)
 {
 	if (b[0])
 		return __ffs(b[0]);
 	if (b[1])
 		return __ffs(b[1]) + 64;
 	return __ffs(b[2]) + 128;
 }

 /**
  * ffs - find first bit set
  * @x: the word to search
  *
  * This is defined the same way as
  * the libc and compiler builtin ffs routines, therefore
  * differs in spirit from the above ffz (man ffs).
  */
 static __inline__ int ffs(int x)
 {
 	int r;

 	__asm__("bsfl %1,%0\n\t"
 		"cmovzl %2,%0"
 		: "=r" (r) : "rm" (x), "r" (-1));
 	return r+1;
 }

 /**
  * fls64 - find last bit set in 64 bit word
  * @x: the word to search
  *
  * This is defined the same way as fls.
  */
 static __inline__ int fls64(__u64 x)
 {
 	if (x == 0)
 		return 0;
 	return __fls(x) + 1;
 }

 /**
  * fls - find last bit set
  * @x: the word to search
  *
  * This is defined the same way as ffs.
  */
 static __inline__ int fls(int x)
 {
 	int r;

 	__asm__("bsrl %1,%0\n\t"
 		"cmovzl %2,%0"
 		: "=&r" (r) : "rm" (x), "rm" (-1));
 	return r+1;
 }

 /**
  * hweightN - returns the hamming weight of a N-bit word
  * @x: the word to weigh
  *
  * The Hamming Weight of a number is the total number of bits set in it.
  */

 #define hweight64(x) generic_hweight64(x)
 #define hweight32(x) generic_hweight32(x)
 #define hweight16(x) generic_hweight16(x)
 #define hweight8(x) generic_hweight8(x)

 #endif /* __KERNEL__ */

 #ifdef __KERNEL__

 #define ext2_set_bit(nr,addr) \
 	__test_and_set_bit((nr),(unsigned long*)addr)
 #define ext2_set_bit_atomic(lock,nr,addr) \
 	        test_and_set_bit((nr),(unsigned long*)addr)
 #define ext2_clear_bit(nr, addr) \
 	__test_and_clear_bit((nr),(unsigned long*)addr)
 #define ext2_clear_bit_atomic(lock,nr,addr) \
 	        test_and_clear_bit((nr),(unsigned long*)addr)
 #define ext2_test_bit(nr, addr)      test_bit((nr),(unsigned long*)addr)
 #define ext2_find_first_zero_bit(addr, size) \
 	find_first_zero_bit((unsigned long*)addr, size)
 #define ext2_find_next_zero_bit(addr, size, off) \
 	find_next_zero_bit((unsigned long*)addr, size, off)

 /* Bitmap functions for the minix filesystem.  */
 #define minix_test_and_set_bit(nr,addr) __test_and_set_bit(nr,(void*)addr)
 #define minix_set_bit(nr,addr) __set_bit(nr,(void*)addr)
 #define minix_test_and_clear_bit(nr,addr) __test_and_clear_bit(nr,(void*)addr)
 #define minix_test_bit(nr,addr) test_bit(nr,(void*)addr)
 #define minix_find_first_zero_bit(addr,size) \
 	find_first_zero_bit((void*)addr,size)

 #endif /* __KERNEL__ */

 #endif /* _X86_64_BITOPS_H */
	#ifndef _X86_64_BITOPS_H
	#define _X86_64_BITOPS_H

	/*
	* Copyright 1992, Linus Torvalds.
	*/

	#include <linux/config.h>

	#ifdef CONFIG_SMP
	#define LOCK_PREFIX "lock ; "
	#else
	#define LOCK_PREFIX ""
	#endif

	#define ADDR ((volatile long ) addr)

	/**
	* set_bit - Atomically set a bit in memory
	* @nr: the bit to set
	* @addr: the address to start counting from
	*
	* This function is atomic and may not be reordered. See __set_bit()
	* if you do not require the atomic guarantees.
	* Note that @nr may be almost arbitrarily large; this function is not
	* restricted to acting on a single-word quantity.
	*/
	static __inline__ void set_bit(int nr, volatile void * addr)
	{
	__asm__ __volatile__( LOCK_PREFIX
	"btsl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr) : "memory");
	}

	/**
	* __set_bit - Set a bit in memory
	* @nr: the bit to set
	* @addr: the address to start counting from
	*
	* Unlike set_bit(), this function is non-atomic and may be reordered.
	* If it's called on the same region of memory simultaneously, the effect
	* may be that only one operation succeeds.
	*/
	static __inline__ void __set_bit(int nr, volatile void * addr)
	{
	__asm__ volatile(
	"btsl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr) : "memory");
	}

	/**
	* clear_bit - Clears a bit in memory
	* @nr: Bit to clear
	* @addr: Address to start counting from
	*
	* clear_bit() is atomic and may not be reordered. However, it does
	* not contain a memory barrier, so if it is used for locking purposes,
	* you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
	* in order to ensure changes are visible on other processors.
	*/
	static __inline__ void clear_bit(int nr, volatile void * addr)
	{
	__asm__ __volatile__( LOCK_PREFIX
	"btrl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr));
	}

	static __inline__ void __clear_bit(int nr, volatile void * addr)
	{
	__asm__ __volatile__(
	"btrl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr));
	}

	#define smp_mb__before_clear_bit() barrier()
	#define smp_mb__after_clear_bit() barrier()

	/**
	* __change_bit - Toggle a bit in memory
	* @nr: the bit to change
	* @addr: the address to start counting from
	*
	* Unlike change_bit(), this function is non-atomic and may be reordered.
	* If it's called on the same region of memory simultaneously, the effect
	* may be that only one operation succeeds.
	*/
	static __inline__ void __change_bit(int nr, volatile void * addr)
	{
	__asm__ __volatile__(
	"btcl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr));
	}

	/**
	* change_bit - Toggle a bit in memory
	* @nr: Bit to change
	* @addr: Address to start counting from
	*
	* change_bit() is atomic and may not be reordered.
	* Note that @nr may be almost arbitrarily large; this function is not
	* restricted to acting on a single-word quantity.
	*/
	static __inline__ void change_bit(int nr, volatile void * addr)
	{
	__asm__ __volatile__( LOCK_PREFIX
	"btcl %1,%0"
	:"+m" (ADDR)
	:"dIr" (nr));
	}

	/**
	* test_and_set_bit - Set a bit and return its old value
	* @nr: Bit to set
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static __inline__ int test_and_set_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__ __volatile__( LOCK_PREFIX
	"btsl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr) : "memory");
	return oldbit;
	}

	/**
	* __test_and_set_bit - Set a bit and return its old value
	* @nr: Bit to set
	* @addr: Address to count from
	*
	* This operation is non-atomic and can be reordered.
	* If two examples of this operation race, one can appear to succeed
	* but actually fail. You must protect multiple accesses with a lock.
	*/
	static __inline__ int __test_and_set_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__(
	"btsl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr));
	return oldbit;
	}

	/**
	* test_and_clear_bit - Clear a bit and return its old value
	* @nr: Bit to clear
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static __inline__ int test_and_clear_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__ __volatile__( LOCK_PREFIX
	"btrl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr) : "memory");
	return oldbit;
	}

	/**
	* __test_and_clear_bit - Clear a bit and return its old value
	* @nr: Bit to clear
	* @addr: Address to count from
	*
	* This operation is non-atomic and can be reordered.
	* If two examples of this operation race, one can appear to succeed
	* but actually fail. You must protect multiple accesses with a lock.
	*/
	static __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__(
	"btrl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr));
	return oldbit;
	}

	/* WARNING: non atomic and it can be reordered! */
	static __inline__ int __test_and_change_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__ __volatile__(
	"btcl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr) : "memory");
	return oldbit;
	}

	/**
	* test_and_change_bit - Change a bit and return its old value
	* @nr: Bit to change
	* @addr: Address to count from
	*
	* This operation is atomic and cannot be reordered.
	* It also implies a memory barrier.
	*/
	static __inline__ int test_and_change_bit(int nr, volatile void * addr)
	{
	int oldbit;

	__asm__ __volatile__( LOCK_PREFIX
	"btcl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit),"+m" (ADDR)
	:"dIr" (nr) : "memory");
	return oldbit;
	}

	#if 0 /* Fool kernel-doc since it doesn't do macros yet */
	/**
	* test_bit - Determine whether a bit is set
	* @nr: bit number to test
	* @addr: Address to start counting from
	*/
	static int test_bit(int nr, const volatile void * addr);
	#endif

	static __inline__ int constant_test_bit(int nr, const volatile void * addr)
	{
	return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
	}

	static __inline__ int variable_test_bit(int nr, volatile const void * addr)
	{
	int oldbit;

	__asm__ __volatile__(
	"btl %2,%1\n\tsbbl %0,%0"
	:"=r" (oldbit)
	:"m" (ADDR),"dIr" (nr));
	return oldbit;
	}

	#define test_bit(nr,addr) \
	(__builtin_constant_p(nr) ? \
	constant_test_bit((nr),(addr)) : \
	variable_test_bit((nr),(addr)))

	#undef ADDR

	extern long find_first_zero_bit(const unsigned long * addr, unsigned long size);
	extern long find_next_zero_bit (const unsigned long * addr, long size, long offset);
	extern long find_first_bit(const unsigned long * addr, unsigned long size);
	extern long find_next_bit(const unsigned long * addr, long size, long offset);

	/* return index of first bet set in val or max when no bit is set */
	static inline unsigned long __scanbit(unsigned long val, unsigned long max)
	{
	asm("bsfq %1,%0 ; cmovz %2,%0" : "=&r" (val) : "r" (val), "r" (max));
	return val;
	}

	#define find_first_bit(addr,size) \
	((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
	(__scanbit((unsigned long )addr,(size))) : \
	find_first_bit(addr,size)))

	#define find_next_bit(addr,size,off) \
	((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
	((off) + (__scanbit(((unsigned long )addr) >> (off),(size)-(off)))) : \
	find_next_bit(addr,size,off)))

	#define find_first_zero_bit(addr,size) \
	((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
	(__scanbit(~(unsigned long )addr,(size))) : \
	find_first_zero_bit(addr,size)))

	#define find_next_zero_bit(addr,size,off) \
	((__builtin_constant_p(size) && (size) <= BITS_PER_LONG ? \
	((off)+(__scanbit(~((((unsigned long )addr)) >> (off)),(size)-(off)))) : \
	find_next_zero_bit(addr,size,off)))

	/*
	* Find string of zero bits in a bitmap. -1 when not found.
	*/
	extern unsigned long
	find_next_zero_string(unsigned long *bitmap, long start, long nbits, int len);

	static inline void set_bit_string(unsigned long *bitmap, unsigned long i,
	int len)
	{
	unsigned long end = i + len;
	while (i < end) {
	__set_bit(i, bitmap);
	i++;
	}
	}

	static inline void __clear_bit_string(unsigned long *bitmap, unsigned long i,
	int len)
	{
	unsigned long end = i + len;
	while (i < end) {
	__clear_bit(i, bitmap);
	i++;
	}
	}

	/**
	* ffz - find first zero in word.
	* @word: The word to search
	*
	* Undefined if no zero exists, so code should check against ~0UL first.
	*/
	static __inline__ unsigned long ffz(unsigned long word)
	{
	__asm__("bsfq %1,%0"
	:"=r" (word)
	:"r" (~word));
	return word;
	}

	/**
	* __ffs - find first bit in word.
	* @word: The word to search
	*
	* Undefined if no bit exists, so code should check against 0 first.
	*/
	static __inline__ unsigned long __ffs(unsigned long word)
	{
	__asm__("bsfq %1,%0"
	:"=r" (word)
	:"rm" (word));
	return word;
	}

	/*
	* __fls: find last bit set.
	* @word: The word to search
	*
	* Undefined if no zero exists, so code should check against ~0UL first.
	*/
	static __inline__ unsigned long __fls(unsigned long word)
	{
	__asm__("bsrq %1,%0"
	:"=r" (word)
	:"rm" (word));
	return word;
	}

	#ifdef __KERNEL__

	static inline int sched_find_first_bit(const unsigned long *b)
	{
	if (b[0])
	return __ffs(b[0]);
	if (b[1])
	return __ffs(b[1]) + 64;
	return __ffs(b[2]) + 128;
	}

	/**
	* ffs - find first bit set
	* @x: the word to search
	*
	* This is defined the same way as
	* the libc and compiler builtin ffs routines, therefore
	* differs in spirit from the above ffz (man ffs).
	*/
	static __inline__ int ffs(int x)
	{
	int r;

	__asm__("bsfl %1,%0\n\t"
	"cmovzl %2,%0"
	: "=r" (r) : "rm" (x), "r" (-1));
	return r+1;
	}

	/**
	* fls64 - find last bit set in 64 bit word
	* @x: the word to search
	*
	* This is defined the same way as fls.
	*/
	static __inline__ int fls64(__u64 x)
	{
	if (x == 0)
	return 0;
	return __fls(x) + 1;
	}

	/**
	* fls - find last bit set
	* @x: the word to search
	*
	* This is defined the same way as ffs.
	*/
	static __inline__ int fls(int x)
	{
	int r;

	__asm__("bsrl %1,%0\n\t"
	"cmovzl %2,%0"
	: "=&r" (r) : "rm" (x), "rm" (-1));
	return r+1;
	}

	/**
	* hweightN - returns the hamming weight of a N-bit word
	* @x: the word to weigh
	*
	* The Hamming Weight of a number is the total number of bits set in it.
	*/

	#define hweight64(x) generic_hweight64(x)
	#define hweight32(x) generic_hweight32(x)
	#define hweight16(x) generic_hweight16(x)
	#define hweight8(x) generic_hweight8(x)

	#endif /* __KERNEL__ */

	#ifdef __KERNEL__

	#define ext2_set_bit(nr,addr) \
	__test_and_set_bit((nr),(unsigned long*)addr)
	#define ext2_set_bit_atomic(lock,nr,addr) \
	test_and_set_bit((nr),(unsigned long*)addr)
	#define ext2_clear_bit(nr, addr) \
	__test_and_clear_bit((nr),(unsigned long*)addr)
	#define ext2_clear_bit_atomic(lock,nr,addr) \
	test_and_clear_bit((nr),(unsigned long*)addr)
	#define ext2_test_bit(nr, addr) test_bit((nr),(unsigned long*)addr)
	#define ext2_find_first_zero_bit(addr, size) \
	find_first_zero_bit((unsigned long*)addr, size)
	#define ext2_find_next_zero_bit(addr, size, off) \
	find_next_zero_bit((unsigned long*)addr, size, off)

	/* Bitmap functions for the minix filesystem. */
	#define minix_test_and_set_bit(nr,addr) __test_and_set_bit(nr,(void*)addr)
	#define minix_set_bit(nr,addr) __set_bit(nr,(void*)addr)
	#define minix_test_and_clear_bit(nr,addr) __test_and_clear_bit(nr,(void*)addr)
	#define minix_test_bit(nr,addr) test_bit(nr,(void*)addr)
	#define minix_find_first_zero_bit(addr,size) \
	find_first_zero_bit((void*)addr,size)

	#endif /* __KERNEL__ */

	#endif /* _X86_64_BITOPS_H */