bit_spin

函数名称：-based spin_lock()* Don't use this unless you really need to: spin_lock() and spin_unlock()* are significantly faster.

函数原型：static inline void bit_spin_lock(int bitnum, unsigned long *addr)

返回类型：void

参数：

类型	参数	名称
int	bitnum
unsigned long *	addr

**调用者**
名称	描述
slab_lock	Per slab locking using the pagelock
pin_tag
end_buffer_async_read
end_buffer_async_write	Completion handler for block_write_full_page() - pages which are unlocked* during I/O, and which have PageWriteback cleared upon I/O completion.
hlist_bl_lock
rht_lock	We lock a bucket by setting BIT(0) in the pointer - this is always* zero in real pointers. The NULLS mark is never stored in the bucket,* rather we store NULL if the bucket is empty.* bit_spin_locks do not handle contention well, but the whole point
rht_lock_nested

函数逻辑报告