fault_in_user_writeable (9) - Linux Man Pages
fault_in_user_writeable: Fault in user address and verify RW access
fault_in_user_writeable - Fault in user address and verify RW access
- pointer to faulting user space address
Slow path to fixup the fault we just took in the atomic write access to uaddr.
We have no generic implementation of a non-destructive write to the user address. We know that we faulted in the atomic pagefault disabled section so we can as well avoid the #PF overhead by calling get_user_pages right away.
Rusty Russell <rusty [at] rustcorp.com.au>