Re: [PATCH v17 19/35] arch/mm: Export direct {un,}map functions

[Christoph Hellwig]

On Thu, Feb 22, 2024 at 03:16:42PM -0800, Elliot Berman wrote:
> Firmware and hypervisor drivers can donate system heap memory to their
> respective firmware/hypervisor entities. Those drivers should unmap the
> pages from the kernel's logical map before doing so.
> 
> Export can_set_direct_map, set_direct_map_invalid_noflush, and
> set_direct_map_default_noflush.

Err, not they should not.  And not using such super low-level interfaces
from modular code.