From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Subject: 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. Link: http://lkml.kernel.org/r/20200629151959.15779-8-willy@xxxxxxxxxxxxx Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mm.h | 1 + 1 file changed, 1 insertion(+) --- a/include/linux/mm.h~mm-introduce-offset_in_thp +++ a/include/linux/mm.h @@ -1594,6 +1594,7 @@ static inline void clear_page_pfmemalloc 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 _
