119  * test_and_set_bit - Set a bit and return its old value
131 	unsigned long old;  in test_and_set_bit()  local
135 	old = *p;  in test_and_set_bit()
136 	*p = old | mask;  in test_and_set_bit()
139 	return (old & mask) != 0;  in test_and_set_bit()
143  * test_and_clear_bit - Clear a bit and return its old value
155 	unsigned long old;  in test_and_clear_bit()  local
159 	old = *p;  in test_and_clear_bit()
160 	*p = old & ~mask;  in test_and_clear_bit()
163 	return (old & mask) != 0;  in test_and_clear_bit()
167  * test_and_change_bit - Change a bit and return its old value
178 	unsigned long old;  in test_and_change_bit()  local
182 	old = *p;  in test_and_change_bit()
183 	*p = old ^ mask;  in test_and_change_bit()
186 	return (old & mask) != 0;  in test_and_change_bit()