函数逻辑报告

函数名称：Return true if we can merge this (vm_flags,anon_vma,file,vm_pgoff)* in front of (at a lower virtual address and file offset than) the vma.* We cannot merge two vmas if they have differently assigned (non-NULL)

函数原型：static int can_vma_merge_before(struct vm_area_struct *vma, unsigned long vm_flags, struct anon_vma *anon_vma, struct file *file, unsigned long vm_pgoff, struct vm_userfaultfd_ctx vm_userfaultfd_ctx)

返回类型：int

参数：