Re: [PATCH v3 04/11] arm64/mm: Add set_memory_device() and set_memory_normal()

On 07/07/2026 2:36 pm, Mike Rapoport wrote:

On Tue, Jul 07, 2026 at 02:17:29PM +0100, Robin Murphy wrote:

quoted

Given the precedent of memblock_mark_nomap(), as long as the reusable
reserved-memory regions also get split into distinct memblocks, then it
seems like in principle we ought to be able to give them a new
MEMBLOCK_PTEMAP (or whatever) flag which could then be picked up in
map_mem() without needing to override force_pte_mapping() globally?

Please don't. _nomap() caused enough pain.

Indeed I was there for pretty much the whole pfn_valid() saga :)

Bad example maybe - in this case the only actual similarity to nomap 
would be the fact that it would also be set by the of_reserved_mem code 
based on what it finds in DT; in all other aspects it should be 
functionally closer to something like MEMBLOCK_RSRV_NOINIT, i.e. just 
carrying information through the mm init phase, then ceasing to matter 
at all once the linear mapping is done.

Cheers,
Robin.