From 646010009d3541b8cb4f803dcb4b8d0da2f22579 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Fri, 7 May 2021 11:17:34 -0400 Subject: mm: Add folio_raw_mapping() Convert __page_rmapping to folio_raw_mapping and move it to mm/internal.h. It's only a couple of instructions (load and mask), so it's definitely going to be cheaper to inline it than call it. Leave page_rmapping out of line. Change page_anon_vma() to not call folio_raw_mapping() -- it's more efficient to do the subtraction than the mask. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: David Howells Acked-by: Vlastimil Babka --- mm/internal.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'mm/internal.h') diff --git a/mm/internal.h b/mm/internal.h index 1a84484f8650..187a032fed4d 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -34,6 +34,13 @@ void page_writeback_init(void); +static inline void *folio_raw_mapping(struct folio *folio) +{ + unsigned long mapping = (unsigned long)folio->mapping; + + return (void *)(mapping & ~PAGE_MAPPING_FLAGS); +} + vm_fault_t do_swap_page(struct vm_fault *vmf); void folio_rotate_reclaimable(struct folio *folio); -- cgit v1.2.3