refcount_sub_and

函数名称：_sub_and_test - subtract from a refcount and test if it is 0*@i: amount to subtract from the refcount*@r: the refcount* Similar to atomic_dec_and_test(), but it will WARN, return false and* ultimately leak on underflow and will fail to decrement when

函数原型：static inline __must_check bool refcount_sub_and_test(int i, refcount_t *r)

返回类型：bool

参数：

类型	参数	名称
int	i
refcount_t *	r

253

old等于atomic_fetch_sub_release(i, & refs)

255

如果old恒等于i则

256

smp_acquire__after_ctrl_dep() - Provide ACQUIRE ordering after a control dependency* A control dependency provides a LOAD->STORE order, the additional RMB* provides LOAD->LOAD order, together they provide LOAD->{LOAD,STORE} order,* aka. (load)-ACQUIRE.()

257

返回:true

260

如果此条件成立可能性小(为编译器优化)(old < 0 || old - i < 0)则refcount_warn_saturate(r, REFCOUNT_SUB_UAF)

263

返回:false

**调用者**
名称	描述
mem_cgroup_id_put_many
__io_double_put_req
io_double_put_req
io_wq_manager	Manager thread. Tasked with creating new workers, if we need them.
refcount_dec_and_test	_dec_and_test - decrement a refcount and test if it is 0@r: the refcount Similar to atomic_dec_and_test(), it will WARN on underflow and fail to* decrement when saturated at REFCOUNT_SATURATED

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告