The quilt patch titled
Subject: mm: reimplement compound_nr()
has been removed from the -mm tree. Its filename was
mm-reimplement-compound_nr.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: reimplement compound_nr()
Date: Wed, 11 Jan 2023 14:29:03 +0000
Turn compound_nr() into a wrapper around folio_nr_pages(). Similarly to
compound_order(), casting the struct page directly to struct folio
preserves the existing behaviour, while calling page_folio() would change
the behaviour. Move thp_nr_pages() down in the file so that compound_nr()
can be after folio_nr_pages().
[willy@xxxxxxxxxxxxx: fix assertion triggering]
Link: https://lkml.kernel.org/r/Y8AFgZEEjnUIaCbf@xxxxxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20230111142915.1001531-18-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/include/linux/mm.h~mm-reimplement-compound_nr
+++ a/include/linux/mm.h
@@ -1005,18 +1005,6 @@ static inline void set_compound_order(st
#endif
}
-/* Returns the number of pages in this potentially compound page. */
-static inline unsigned long compound_nr(struct page *page)
-{
- if (!PageHead(page))
- return 1;
-#ifdef CONFIG_64BIT
- return page[1].compound_nr;
-#else
- return 1UL << compound_order(page);
-#endif
-}
-
/* Returns the number of bytes in this potentially compound page. */
static inline unsigned long page_size(struct page *page)
{
@@ -1040,16 +1028,6 @@ static inline unsigned int thp_order(str
}
/**
- * thp_nr_pages - The number of regular pages in this huge page.
- * @page: The head page of a huge page.
- */
-static inline int thp_nr_pages(struct page *page)
-{
- VM_BUG_ON_PGFLAGS(PageTail(page), page);
- return compound_nr(page);
-}
-
-/**
* thp_size - Size of a transparent huge page.
* @page: Head page of a transparent huge page.
*
@@ -1758,6 +1736,33 @@ static inline long folio_nr_pages(struct
#endif
}
+/*
+ * compound_nr() returns the number of pages in this potentially compound
+ * page. compound_nr() can be called on a tail page, and is defined to
+ * return 1 in that case.
+ */
+static inline unsigned long compound_nr(struct page *page)
+{
+ struct folio *folio = (struct folio *)page;
+
+ if (!test_bit(PG_head, &folio->flags))
+ return 1;
+#ifdef CONFIG_64BIT
+ return folio->_folio_nr_pages;
+#else
+ return 1L << folio->_folio_order;
+#endif
+}
+
+/**
+ * thp_nr_pages - The number of regular pages in this huge page.
+ * @page: The head page of a huge page.
+ */
+static inline int thp_nr_pages(struct page *page)
+{
+ return folio_nr_pages((struct folio *)page);
+}
+
/**
* folio_next - Move to the next physical folio.
* @folio: The folio we're currently operating on.
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
