Name
clear_bit —
Clears a bit in memory
Synopsis
void clear_bit (int 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_clear_bit and/or smp_mb__after_clear_bit
in order to ensure changes are visible on other processors.