Commit ee6c400f authored Aug 14, 2020 by Matthew Wilcox (Oracle) Committed by Linus Torvalds Aug 14, 2020

mm: introduce offset_in_thp



Mirroring offset_in_page(), this gives you the offset within this
particular page, no matter what size page it is.  It optimises down to
offset_in_page() if CONFIG_TRANSPARENT_HUGEPAGE is not set.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: http://lkml.kernel.org/r/20200629151959.15779-8-willy@infradead.org


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 2be1d718

include/linux/mm.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -1594,6 +1594,7 @@ static inline void clear_page_pfmemalloc(struct page *page)
		extern void pagefault_out_of_memory(void);

		#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
		#define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1))

		/*
		* Flags passed to show_mem() and show_free_areas() to suppress output in

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