linux-master/kernel/fork.c

613 static void dup_mm_exe_file(struct mm_struct *mm, struct mm_struct *oldmm)
617 	exe_file = get_mm_exe_file(oldmm);
620 	 * We depend on the oldmm having properly denied write access to the
629 					struct mm_struct *oldmm)
638 	if (mmap_write_lock_killable(oldmm)) {
642 	flush_cache_dup_mm(oldmm);
643 	uprobe_dup_mmap(oldmm, mm);
650 	dup_mm_exe_file(mm, oldmm);
652 	mm->total_vm = oldmm->total_vm;
653 	mm->data_vm = oldmm->data_vm;
654 	mm->exec_vm = oldmm->exec_vm;
655 	mm->stack_vm = oldmm->stack_vm;
657 	retval = ksm_fork(mm, oldmm);
660 	khugepaged_fork(mm, oldmm);
663 	retval = __mt_dup(&oldmm->mm_mt, &mm->mm_mt, GFP_KERNEL);
693 			if (security_vm_enough_memory_mm(oldmm, len)) /* sic */
759 	retval = arch_dup_mmap(oldmm, mm);
777 	flush_tlb_mm(oldmm);
778 	mmap_write_unlock(oldmm);
807 static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
809 	mmap_write_lock(oldmm);
810 	dup_mm_exe_file(mm, oldmm);
811 	mmap_write_unlock(oldmm);
1666  * @oldmm: the mm to duplicate.
1668  * Allocates a new mm structure and duplicates the provided @oldmm structure
1674 				struct mm_struct *oldmm)
1683 	memcpy(mm, oldmm, sizeof(*mm));
1688 	err = dup_mmap(mm, oldmm);
1712 	struct mm_struct *mm, *oldmm;
1729 	oldmm = current->mm;
1730 	if (!oldmm)
1734 		mmget(oldmm);
1735 		mm = oldmm;