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mm: Make large folios depend on THP

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Some parts of the VM still depend on THP to handle large folios
correctly.  Until those are fixed, prevent creating large folios
if THP are disabled.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-15 23:27:08 -05:00
parent 06d44142d4
commit 421f1ab484
1 changed files with 6 additions and 1 deletions
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7
include/linux/pagemap.h
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@ -306,9 +306,14 @@ static inline void mapping_set_large_folios(struct address_space *mapping)
__set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
}
/*
* Large folio support currently depends on THP. These dependencies are
* being worked on but are not yet fixed.
*/
static inline bool mapping_large_folio_support(struct address_space *mapping)
{
return test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
return IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
test_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags);
}
static inline int filemap_nr_thps(struct address_space *mapping)