search for: reserve_pfn_range

The function that returns ENOMEM is actually copy_mm. It returns ENOMEM when dup_mm returns 0. copy_mm receives clone_flags and task_struct * tsk. I think tsk is pointing to the new task (the process being forked). copy_mm assigns some values into *tsk, then: tsk->mm = NULL; tsk->active_mm = NULL; then we check if current process has ->mm; if not, return 0 (effectively