Re: [PATCH v10 3/7] drm/tyr: add Memory Management Unit (MMU) support

On Tue Jul 28, 2026 at 8:39 PM CEST, Deborah Brouwer wrote:
> +/// Locked wrapper for carrying out virtual memory (VM) operations on the MMU.
> +#[pin_data]
> +pub(crate) struct Mmu<'drm> {

This shouldn't be 'drm, but 'mmu or just something generic like 'a.

The rationale is that Mmu might be shorter lived than 'drm once we have
self-referencial pin-init. Currently it is straight forward, such as in

	struct Foo<'foo> {
	    dev: &'foo platform::Device<Bound>,
	}
	
	struct Data<'bound> {
	    foo: Foo<'bound>,
	}

where the lifetime of `dev` really ties back to 'bound. However, with
self-referencial pin-init it could looks like this:

	struct Foo<'foo> {
	    dev: &'foo platform::Device<Bound>,
	    io: &'foo IoMem<'foo>,
	}
	
	struct Data<'bound> {
	    foo: Foo<'io>,
	    io: IoMem<'bound>,
	}

Now Foo is not constrained to 'bound anymore, as this would be longer lived than
`io`, so it has to capture 'io instead in order to still compile.