_clear_bit        154 arch/arm/include/asm/bitops.h extern void _clear_bit(int nr, volatile unsigned long * p);
_clear_bit         18 arch/arm/include/asm/sync_bitops.h #define sync_clear_bit(nr, p)		_clear_bit(nr, p)
_clear_bit        150 arch/arm/kernel/armksyms.c EXPORT_SYMBOL(_clear_bit);