On 07/07/2026 2:36 pm, Mike Rapoport wrote:
On Tue, Jul 07, 2026 at 02:17:29PM +0100, Robin Murphy wrote:
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.
