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The comment in mmzone.h currently details exhaustive per-architecture bit-width lists and explains alignment using min(PAGE_SHIFT, PFN_SECTION_SHIFT). Such details risk falling out of date over time and may inadvertently be left un-updated. We always expect a single section to cover full pages. Therefore, we can safely assume that PFN_SECTION_SHIFT is large enough to accommodate SECTION_MAP_LAST_BIT. We use BUILD_BUG_ON() to ensure this. Update the comment to accurately reflect this consensus, making it clear that we rely on a single section covering full pages. Link: https://lore.kernel.org/20260402102320.3617578-1-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Petr Tesarik <ptesarik@suse.com> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>