Re: [PATCH] mm/mmap: Don't unlock VMAs in remap_file_pages()

[Matthew Wilcox]

On Tue, Dec 15, 2020 at 09:13:00AM -0500, Liam R. Howlett wrote:
> @@ -3025,25 +3025,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
>  
>  	flags &= MAP_NONBLOCK;
>  	flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
> -	if (vma->vm_flags & VM_LOCKED) {
> -		struct vm_area_struct *tmp;
> -		flags |= MAP_LOCKED;

I think you need to keep ^^^ that line because the vma needs to stay
mlocked.