Re: [PATCH 4/5] mm/mseal: separate out and simplify VMA gap check

[Pedro Falcato <pfalcato@suse.de>]

On Mon, Jul 14, 2025 at 02:00:39PM +0100, Lorenzo Stoakes wrote:
> The check_mm_seal() function is doing something general - checking whether
> a range contains only VMAs (or rather that it does NOT contain any unmapped
> regions).
> 
> Generalise this and put the logic in mm/vma.c - introducing
> range_contains_unmapped(). Additionally we can simplify the logic, we are
> simply checking whether the last vma->vm_end has either a VMA starting
> after it or ends before the end parameter.
>

I don't like this. Unless you have any other user for this in mind,
we'll proliferate this awful behavior (and add this into core vma code).

I have some patches locally to fully remove this upfront check, and AFAIK
we're somewhat in agreement that we can simply nuke this check (for
various reasons, including that we *still* don't have a man page for the
syscall). I can send them for proper discussion after your series lands.

-- 
Pedro