+ hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: hugetlb: document the new location of page subpool pointer
has been added to the -mm tree.  Its filename is
     hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2.patch

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------------------------------------------------------
From: Mike Kravetz <mike.kravetz@oracle.com>
Subject: hugetlb: document the new location of page subpool pointer

Expand comments, no functional change.

Link: https://lkml.kernel.org/r/20210224040439.351882-1-mike.kravetz@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/hugetlb.h |    3 +++
 1 file changed, 3 insertions(+)

--- a/include/linux/hugetlb.h~hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2
+++ a/include/linux/hugetlb.h
@@ -476,6 +476,9 @@ unsigned long hugetlb_get_unmapped_area(
  * huegtlb page specific state flags.  These flags are located in page.private
  * of the hugetlb head page.  Functions created via the below macros should be
  * used to manipulate these flags.
+ * Note: The hugetlb page subpool pointer previously located at page.private
+ * was moved to page[1].private to make room for flags in the head page.  See
+ * hugetlb_page_subpool().
  *
  * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
  *	allocation time.  Cleared when page is fully instantiated.  Free
_

Patches currently in -mm which might be from mike.kravetz@oracle.com are

hugetlb-fix-update_and_free_page-contig-page-struct-assumption.patch
hugetlb-fix-copy_huge_page_from_user-contig-page-struct-assumption.patch
hugetlb-use-pageprivate-for-hugetlb-specific-page-flags.patch
hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix.patch
hugetlb-use-pageprivate-for-hugetlb-specific-page-flags-fix-2.patch
hugetlb-convert-page_huge_active-hpagemigratable-flag.patch
hugetlb-convert-pagehugetemporary-to-hpagetemporary-flag.patch
hugetlb-convert-pagehugefreed-to-hpagefreed-flag.patch
include-linux-hugetlbh-add-synchronization-information-for-new-hugetlb-specific-flags.patch
mm-hugetlb-change-hugetlb_reserve_pages-to-type-bool.patch
hugetlbfs-remove-special-hugetlbfs_set_page_dirty.patch