1. NAME▲

clear_bit - Clears a bit in memory

2. SYNOPSIS ▲

void clear_bit(int  nr , volatile unsigned long *  addr );

3. ARGUMENTS ▲

nr
    Bit to clear

addr
    Address to start counting from

4. 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.

5. COPYRIGHT ▲