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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-08-14 17:30:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-14 19:56:56 -0700
commitee6c400f5c05459b8c5f2884a176a1287ce2f68f (patch)
tree1c6b77eeb0209995bf012dcbe90bcd1ef76a1fcc
parent2be1d71841b7ecfb01ce4c59f6e1d082c3c18a8a (diff)
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>
-rw-r--r--include/linux/mm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fd0cd4e93029..2e7ec3ee34cf 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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