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mm: reimplement folio_order() and folio_nr_pages()

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Instead of calling compound_order() and compound_nr_pages(), use the folio
directly.  Saves 1905 bytes from mm/filemap.o due to folio_test_large()
now being a cheaper check than PageHead().

Link: https://lkml.kernel.org/r/20220902194653.1739778-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:45:59 +01:00 committed by Andrew Morton
parent 379708ffde
commit c3a15bff46
1 changed files with 10 additions and 2 deletions
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12
include/linux/mm.h
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@ -729,7 +729,9 @@ static inline unsigned int compound_order(struct page *page)
*/
static inline unsigned int folio_order(struct folio *folio)
{
return compound_order(&folio->page);
if (!folio_test_large(folio))
return 0;
return folio->_folio_order;
}
#include <linux/huge_mm.h>
@ -1659,7 +1661,13 @@ static inline void set_page_links(struct page *page, enum zone_type zone,
*/
static inline long folio_nr_pages(struct folio *folio)
{
return compound_nr(&folio->page);
if (!folio_test_large(folio))
return 1;
#ifdef CONFIG_64BIT
return folio->_folio_nr_pages;
#else
return 1L << folio->_folio_order;
#endif
}
/**