[PATCH 01/12] mm: khugepaged: remove outdated comments and check for shmem

[Baolin Wang <baolin.wang@linux.alibaba.com>]

After commit eb92d97f7e6a ("Revert 'tmpfs: don't enable large folios if
not supported'"), all shmem mounts can support large folios unconditionally,
so drop the outdated comments and the check for shmem in collapse_file().

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 mm/khugepaged.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index a3a9e4d93b46..21d75f5b4b4d 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2192,12 +2192,9 @@ static enum scan_result collapse_file(struct mm_struct *mm, unsigned long addr,
 	bool is_shmem = shmem_file(file);
 
 	/*
-	 * MADV_COLLAPSE ignores shmem huge config, so do not check shmem
-	 *
-	 * TODO: once shmem always calls mapping_set_large_folios() on its
-	 * mapping, the shmem check can be removed.
+	 * MADV_COLLAPSE ignores shmem huge config, so do not check shmem.
 	 */
-	VM_WARN_ON_ONCE(!is_shmem && !mapping_pmd_folio_support(mapping));
+	VM_WARN_ON_ONCE(!mapping_pmd_folio_support(mapping));
 	VM_WARN_ON_ONCE(start & (HPAGE_PMD_NR - 1));
 
 	result = alloc_charge_folio(&new_folio, mm, cc, HPAGE_PMD_ORDER);
-- 
2.47.3