On Fri, Dec 17, 2021 at 12:30:41PM +0100, David Hildenbrand wrote:
Let's return early for hugetlb, which really only relies on the compound mapcount so far and does not support PageDoubleMap() yet. Use the chance to cleanup the file-THP case to make it easier to grasp. While at it, use head_compound_mapcount().
This is a preparation for further changes.
Reviewed-by: Peter Xu peterx@redhat.com Signed-off-by: David Hildenbrand david@redhat.com
mm/util.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/mm/util.c b/mm/util.c index 741ba32a43ac..3239e75c148d 100644 --- a/mm/util.c +++ b/mm/util.c @@ -732,15 +732,18 @@ int __page_mapcount(struct page *page) { int ret;
- ret = atomic_read(&page->_mapcount) + 1;
- if (PageHuge(page))
return compound_mapcount(page);
It would be nice to make PageHuge() inlinable first. It's a shame the we need to have to do a function call for PageHuge() check.
Otherwise, looks good:
Acked-by: Kirill A. Shutemov kirill.shutemov@linux.intel.com