huge_memory: return -EINVAL in folio split functions when THP is disabled

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split_huge_page_to_list_[to_order](), split_huge_page() and
try_folio_split() return 0 on success and error codes on failure.

When THP is disabled, these functions return 0 indicating success even
though an error code should be returned as it is not possible to split a
folio when THP is disabled.

Make all these functions return -EINVAL to indicate failure instead of 0. 
As large folios depend on CONFIG_THP, issue warning as this function
should not be called without a large folio.

Link: https://lkml.kernel.org/r/20250905150012.93714-1-kernel@pankajraghav.com
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202509051753.riCeG7LC-lkp@intel.com/
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Pankaj Raghav 2025-09-05 17:00:12 +02:00 • committed by Andrew Morton

parent 0faa77afe7

commit a488ba3124

1 changed files with 8 additions and 4 deletions

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include/linux/huge_mm.h

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