+ mm-add-thp_order.patch added to -mm tree

+ mm-add-thp_order.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: add thp_order
has been added to the -mm tree.  Its filename is
     mm-add-thp_order.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-add-thp_order.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-thp_order.patch

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: add thp_order

This function returns the order of a transparent huge page.  It compiles
to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled.

Link: http://lkml.kernel.org/r/20200629151959.15779-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/huge_mm.h |   19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

--- a/include/linux/huge_mm.h~mm-add-thp_order
+++ a/include/linux/huge_mm.h
@@ -258,6 +258,19 @@ static inline spinlock_t *pud_trans_huge
 	else
 		return NULL;
 }
+
+/**
+ * thp_order - Order of a transparent huge page.
+ * @page: Head page of a transparent huge page.
+ */
+static inline unsigned int thp_order(struct page *page)
+{
+	VM_BUG_ON_PGFLAGS(PageTail(page), page);
+	if (PageHead(page))
+		return HPAGE_PMD_ORDER;
+	return 0;
+}
+
 static inline int hpage_nr_pages(struct page *page)
 {
 	if (unlikely(PageTransHuge(page)))
@@ -317,6 +330,12 @@ static inline struct list_head *page_def
 #define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
 #define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
 
+static inline unsigned int thp_order(struct page *page)
+{
+	VM_BUG_ON_PGFLAGS(PageTail(page), page);
+	return 0;
+}
+
 static inline int hpage_nr_pages(struct page *page)
 {
 	VM_BUG_ON_PAGE(PageTail(page), page);
_

Patches currently in -mm which might be from willy@infradead.org are

vmalloc-convert-to-xarray.patch
mm-store-compound_nr-as-well-as-compound_order.patch
mm-move-page-flags-include-to-top-of-file.patch
mm-add-thp_order.patch
mm-add-thp_size.patch
mm-replace-hpage_nr_pages-with-thp_nr_pages.patch
mm-add-thp_head.patch
mm-introduce-offset_in_thp.patch