percpu_ref_tryget

Name:percpu_ref_tryget - try to increment a percpu refcount*@ref: percpu_ref to try-get* Increment a percpu refcount unless its count already reached zero.* Returns %true on success; %false on failure.

Proto:static inline bool percpu_ref_tryget(struct percpu_ref *ref)

Type:bool

Parameter:

Type	Parameter	Name
struct percpu_ref *	ref

223

__percpu * percpu_count

226

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

228

If Internal helper. Don't use outside percpu-refcount proper. The* function doesn't return the pointer and let the caller test it for NULL* because doing so forces the compiler to generate two conditional Then

229

this_cpu_inc( * percpu_count)

230

ret = true

231

Else

232

ret = atomic_long_inc_not_zero( & count)

235

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

237

Return ret

**Caller**
Name	Describe
blk_mq_timeout_work
blk_mq_queue_tag_busy_iter	lk_mq_queue_tag_busy_iter - iterate over all requests with a driver tag*@q: Request queue to examine
io_get_req
SYSCALL_DEFINE6

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion

Function report