Ask the page what size it is instead of assuming it's PMD size.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-7-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
page = compound_head(page);
_total_mapcount = ret = 0;
page = compound_head(page);
_total_mapcount = ret = 0;
- for (i = 0; i < HPAGE_PMD_NR; i++) {
+ for (i = 0; i < thp_nr_pages(page); i++) {
mapcount = atomic_read(&page[i]._mapcount) + 1;
ret = max(ret, mapcount);
_total_mapcount += mapcount;
}
if (PageDoubleMap(page)) {
ret -= 1;
mapcount = atomic_read(&page[i]._mapcount) + 1;
ret = max(ret, mapcount);
_total_mapcount += mapcount;
}
if (PageDoubleMap(page)) {
ret -= 1;
- _total_mapcount -= HPAGE_PMD_NR;
+ _total_mapcount -= thp_nr_pages(page);
}
mapcount = compound_mapcount(page);
ret += mapcount;
}
mapcount = compound_mapcount(page);
ret += mapcount;