mm: alloc_anon_folio: avoid doing vma_thp_gfp_mask in fallback cases

Fallback rates surpassing 90% have been observed on phones utilizing 64KiB
CONT-PTE mTHP.  In these scenarios, when one out of every 16 PTEs fails to
allocate large folios, the remaining 15 PTEs fallback.  Consequently,
invoking vma_thp_gfp_mask seems redundant in such cases.  Furthermore,
abstaining from its use can also contribute to improved code readability.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Barry Song <[email protected]>
Reviewed-by: Zi Yan <[email protected]>
Acked-by: Yu Zhao <[email protected]>
Reviewed-by: Ryan Roberts <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Itaru Kitayama <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Luis Chamberlain <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Yang Shi <[email protected]>
Cc: Yin Fengwei <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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