clear_bit (9) Linux Manual Page
clear_bit – Clears a bit in memory
Synopsis
void clear_bit(long nr, volatile unsigned long *addr);Arguments
nr
-
- Bit to clear
addr
- Address to start counting from
Description
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_atomic and/or smp_mb__after_atomic in order to ensure changes are visible on other processors.