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mm/Kconfig: make FLATMEM depend on !NUMA

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Patch series "mm/page_ext: remove pgdat_page_ext_init()", v2.

pgdat_page_ext_init() has no effect on FLATMEM. The pgdat is always
the zero-initialized contig_page_data, because no architecture
supports FLATMEM + NUMA.

That constraint is only implicit in the arch Kconfig files. So patch 1
makes it explicit in mm/Kconfig, and patch 2 removes pgdat_page_ext_init().

No functional change.


This patch (of 2):

FLATMEM + NUMA is not supported by any architecture and fails to build. 
The constraint is only implicit in the arch Kconfig files.

So make it explicit in mm/Kconfig.

No functional change.

Link: https://lore.kernel.org/20260804151145.3419768-1-ekffu200098@gmail.com
Link: https://lore.kernel.org/20260804151145.3419768-2-ekffu200098@gmail.com
Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com>
Suggested-by: Zi Yan <ziy@nvidia.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sang-Heon Jeon 2026-08-05 00:11:41 +09:00 committed by Andrew Morton
parent 6fd3e592c0
commit 34568000f3
1 changed files with 2 additions and 0 deletions
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2
mm/Kconfig
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@ -390,6 +390,7 @@ choice
config FLATMEM_MANUAL
bool "Flat Memory"
depends on !NUMA
depends on !ARCH_SPARSEMEM_ENABLE || ARCH_FLATMEM_ENABLE
help
This option is best suited for non-NUMA systems with
@ -424,6 +425,7 @@ config SPARSEMEM
config FLATMEM
def_bool y
depends on !NUMA
depends on !SPARSEMEM || FLATMEM_MANUAL
#