Re: [PATCH v2 7/8] mm/migrate: enable noref migration for jbd2

[Davidlohr Bueso <dave@xxxxxxxxxxxx>]

On Thu, 10 Apr 2025, Jan Kara wrote:

> > @@ -851,6 +851,8 @@ static int __buffer_migrate_folio(struct address_space *mapping,
> > 		bool busy;
> > 		bool invalidated = false;
> >
> > +		VM_WARN_ON_ONCE(test_and_set_bit_lock(BH_Migrate,
> > +						      &head->b_state));
>
> Careful here. This breaks the logic with !CONFIG_DEBUG_VM.

Ok, I guess just a WARN_ON_ONCE() here then.