1CLEAR_BIT(9)               Basic C Library Functions              CLEAR_BIT(9)
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NAME

6       clear_bit - Clears a bit in memory
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SYNOPSIS

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

12       nr
13           Bit to clear
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15       addr
16           Address to start counting from
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DESCRIPTION

19       clear_bit is atomic and may not be reordered. However, it does not
20       contain a memory barrier, so if it is used for locking purposes, you
21       should call smp_mb__before_clear_bit and/or smp_mb__after_clear_bit in
22       order to ensure changes are visible on other processors.
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25Kernel Hackers Manual 2.6.       November 2011                    CLEAR_BIT(9)
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