Re: [PATCH v2 bpf-next 3/3] mm: Introduce VM_SPARSE kind and vm_area_[un]map_pages().

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Tue, Feb 27, 2024 at 05:31:28PM -0800, Alexei Starovoitov wrote:
> What would it look like with a cookie?
> A static inline wrapper around get_vm_area() that returns area->addr ?
> And the start address of vmap range will be such a cookie?

Hmm, just making the kernel virtual address the cookie actually
sounds pretty neat indeed even if I did not have that in mind.

> I guess I don't understand the motivation to hide 'struct vm_struct *'.

The prime reason is that then people will try to start random APIs that
work on it.  But let's give it a try without the wrappers and see how
things go.