Re: [PATCH v9 02/10] of: reserved_mem: Introduce "ll-map" property

On Wed, Sep 02, 2026 at 11:47:04AM +0100, Vincent Donnefort wrote:

Keeping last-level mappings is interesting on some architectures as it allows mapping/unmapping pages from the kernel direct map without the risk of splitting blocks which, under the break-before-make rule, may trigger page-faults the kernel can't handle.

Add an "ll-map" property for reserved-memory regions. When set, it splits the underlying memblock and sets the MEMBLOCK_LLMAP flag.

Where is this documented? Any DT property must have a schema.

Though I'm not thrilled about more flag properties. Handling all the combinations of properties has proven to be painful. Can this be implied from the compatible string instead?

Rob