asm-generic/bitops/generic-non-atomic.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
19  * generic___set_bit - Set a bit in memory
23  * Unlike set_bit(), this function is non-atomic and may be reordered.
28 generic___set_bit(unsigned long nr, volatile unsigned long *addr)  in generic___set_bit()
37 generic___clear_bit(unsigned long nr, volatile unsigned long *addr)  in generic___clear_bit()
46  * generic___change_bit - Toggle a bit in memory
50  * Unlike change_bit(), this function is non-atomic and may be reordered.
55 generic___change_bit(unsigned long nr, volatile unsigned long *addr)  in generic___change_bit()
64  * generic___test_and_set_bit - Set a bit and return its old value
68  * This operation is non-atomic and can be reordered.
73 generic___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)  in generic___test_and_set_bit()
84  * generic___test_and_clear_bit - Clear a bit and return its old value
88  * This operation is non-atomic and can be reordered.
93 generic___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)  in generic___test_and_clear_bit()
103 /* WARNING: non atomic and it can be reordered! */
105 generic___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)  in generic___test_and_change_bit()
116  * generic_test_bit - Determine whether a bit is set
121 generic_test_bit(unsigned long nr, const volatile unsigned long *addr)  in generic_test_bit()
125 	 * so `volatile` must always stay here with no cast-aways. See  in generic_test_bit()
128 	return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));  in generic_test_bit()
132  * generic_test_bit_acquire - Determine, with acquire semantics, whether a bit is set
137 generic_test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)  in generic_test_bit_acquire()
140 	return 1UL & (smp_load_acquire(p) >> (nr & (BITS_PER_LONG-1)));  in generic_test_bit_acquire()
144  * const_*() definitions provide good compile-time optimizations when
156  * const_test_bit - Determine whether a bit is set
160  * A version of generic_test_bit() which discards the `volatile` qualifier to
161  * allow a compiler to optimize code harder. Non-atomic and to be called only
162  * for testing compile-time constants, e.g. by the corresponding macros, not
166 const_test_bit(unsigned long nr, const volatile unsigned long *addr)  in const_test_bit()