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mm: allow can_split_folio() to be called when THP are disabled

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The call to can_split_folio() in vmscan is currently guarded by a test of
PageTransHuge() so the BUILD_BUG() is eliminated if THP are disabled.  The
next patch replaces that test with folio_test_large() which may be true,
even when THP are disabled.  However, if THP are disabled, we cannot
split, so an unconditional return of false is appropriate.

Link: https://lkml.kernel.org/r/20220504182857.4013401-15-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-05-12 20:23:03 -07:00 committed by Andrew Morton
parent 246b648038
commit dc786690a6
1 changed files with 0 additions and 1 deletions
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include/linux/huge_mm.h
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@ -348,7 +348,6 @@ static inline void prep_transhuge_page(struct page *page) {}
static inline bool
can_split_folio(struct folio *folio, int *pextra_pins)
{
BUILD_BUG();
return false;
}
static inline int