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_clear_bit and/or smp_mb__after_clear_bit in order to ensure changes are visible on other processors.

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