copy_from_user_nmi

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

Proto:unsigned long copy_from_user_nmi(void *to, const void __user *from, unsigned long n)

Type:unsigned long

Parameter:

Type	Parameter	Name
void *	to
const void __user *	from
unsigned long	n

21

If __range_not_ok(from, n, TASK_SIZE) Then Return n

24

If Not 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. Then Return 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 = 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

Return ret

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