copy_from_user_nmi

函数名称：We rely on the nested NMI work to allow atomic faults from the NMI path; the* nested NMI paths are careful to preserve CR2.

函数原型：unsigned long copy_from_user_nmi(void *to, const void __user *from, unsigned long n)

返回类型：unsigned long

参数：

类型	参数	名称
void *	to
const void __user *	from
unsigned long	n

21

如果__range_not_ok(from, n, TASK_SIZE)则返回:n

24

如果非Blindly accessing user memory from NMI context can be dangerous* if we're in the middle of switching the current user task or* switching the loaded mm. It can also be dangerous if we* interrupted some kernel code that was temporarily using a* different mm.则返回:n

32

These routines enable/disable the pagefault handler. If disabled, it will* not take any locks and go straight to the fixup table.* User access methods will not sleep when called from a pagefault_disabled()* environment.

33

ret等于Architectures should provide two primitives (raw_copy_{to,from}_user())* and get rid of their private instances of copy_{to,from}_user() and* __copy_{to,from}_user{,_inatomic}().* raw_copy_{to,from}_user(to, from, size) should copy up to size bytes and

34

pagefault_enable()

36

返回:ret

**调用者**
名称	描述
__output_copy_user

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