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Existing hugetlb_cma parameter handling logic rejects sizes smaller than one gigantic page, but rounds up larger sizes that are not a multiple of it. The two behaviors are inconsistent and neither is documented. To remove existing inconsistent and undefined behavior, restrict hugetlb_cma parameter to only accept multiples of the gigantic page size. After this restriction, the redundant round_up() in the allocation loop can be removed. The new restriction is also documented in kernel-parameters.txt. Also, including other minor changes for readability improvement with no functional change. Link: https://lore.kernel.org/20260503084225.415980-1-ekffu200098@gmail.com Signed-off-by: Sang-Heon Jeon <ekffu200098@gmail.com> Suggested-by: Muchun Song <muchun.song@linux.dev> Acked-by: Muchun Song <muchun.song@linux.dev> Acked-by: Oscar Salvador <osalvador@suse.de> Cc: David Hildenbrand <david@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>