1 /* SPDX-License-Identifier: GPL-2.0 */
6  * Copyright (C) 1998-2003 Hewlett-Packard Co
7  *	David Mosberger-Tang <davidm@hpl.hp.com>
23  * set_bit - Atomically set a bit in memory
24  * @nr: the bit to set
30  * restricted to acting on a single-word quantity.
34  * operate on hw-defined data-structures, so we can't easily change these
37  * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
42 	__u32 bit, old, new;  in set_bit()  local
47 	bit = 1 << (nr & 31);  in set_bit()
51 		new = old | bit;  in set_bit()
56  * __set_bit - Set a bit in memory
57  * @nr: the bit to set
60  * Unlike set_bit(), this function is non-atomic and may be reordered.
71  * clear_bit - Clears a bit in memory
72  * @nr: Bit to clear
97  * clear_bit_unlock - Clears a bit in memory with release
98  * @nr: Bit to clear
121  * __clear_bit_unlock - Non-atomically clears a bit in memory with release
122  * @nr: Bit to clear
138  * __clear_bit - Clears a bit in memory (non-atomic version)
139  * @nr: the bit to clear
142  * Unlike clear_bit(), this function is non-atomic and may be reordered.
153  * change_bit - Toggle a bit in memory
154  * @nr: Bit to toggle
159  * restricted to acting on a single-word quantity.
164 	__u32 bit, old, new;  in change_bit()  local
169 	bit = (1 << (nr & 31));  in change_bit()
173 		new = old ^ bit;  in change_bit()
178  * __change_bit - Toggle a bit in memory
179  * @nr: the bit to toggle
182  * Unlike change_bit(), this function is non-atomic and may be reordered.
193  * test_and_set_bit - Set a bit and return its old value
194  * @nr: Bit to set
203 	__u32 bit, old, new;  in test_and_set_bit()  local
208 	bit = 1 << (nr & 31);  in test_and_set_bit()
212 		new = old | bit;  in test_and_set_bit()
214 	return (old & bit) != 0;  in test_and_set_bit()
218  * test_and_set_bit_lock - Set a bit and return its old value for lock
219  * @nr: Bit to set
227  * __test_and_set_bit - Set a bit and return its old value
228  * @nr: Bit to set
231  * This operation is non-atomic and can be reordered.  
247  * test_and_clear_bit - Clear a bit and return its old value
248  * @nr: Bit to clear
272  * __test_and_clear_bit - Clear a bit and return its old value
273  * @nr: Bit to clear
276  * This operation is non-atomic and can be reordered.  
292  * test_and_change_bit - Change a bit and return its old value
293  * @nr: Bit to change
302 	__u32 bit, old, new;  in test_and_change_bit()  local
307 	bit = (1 << (nr & 31));  in test_and_change_bit()
311 		new = old ^ bit;  in test_and_change_bit()
313 	return (old & bit) != 0;  in test_and_change_bit()
317  * __test_and_change_bit - Change a bit and return its old value
318  * @nr: Bit to change
321  * This operation is non-atomic and can be reordered.
326 	__u32 old, bit = (1 << (nr & 31));  in __test_and_change_bit()  local
330 	*m = old ^ bit;  in __test_and_change_bit()
331 	return (old & bit) != 0;  in __test_and_change_bit()
341  * ffz - find the first zero bit in a long word
342  * @x: The long word to find the bit in
344  * Returns the bit-number (0..63) of the first (least significant) zero bit.
352 	result = ia64_popcnt(x & (~x - 1));  in ffz()
357  * __ffs - find first bit in word.
360  * Undefined if no bit exists, so code should check against 0 first.
367 	result = ia64_popcnt((x-1) & ~x);  in __ffs()
374  * Return bit number of last (most-significant) bit set.  Undefined
384 	return exp - 0xffff;  in ia64_fls()
388  * Find the last (most significant) bit set.  Returns 0 for x==0 and
406  * Find the last (most significant) bit set.  Undefined for x==0.
418 	return ia64_popcnt(x) - 1;  in __fls()
421 #include <asm-generic/bitops/fls64.h>
423 #include <asm-generic/bitops/builtin-ffs.h>
427  * of bits set) of a N-bit word
440 #include <asm-generic/bitops/const_hweight.h>
444 #include <asm-generic/bitops/find.h>
448 #include <asm-generic/bitops/le.h>
450 #include <asm-generic/bitops/ext2-atomic-setbit.h>
452 #include <asm-generic/bitops/sched.h>