+ hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually.patch added to mm-stable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: hugetlb: clear flags in tail pages that will be freed individually
has been added to the -mm mm-stable branch.  Its filename is
     hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually.patch

This patch will later appear in the mm-stable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Mike Kravetz <mike.kravetz@oracle.com>
Subject: hugetlb: clear flags in tail pages that will be freed individually
Date: Tue, 22 Aug 2023 15:30:43 -0700

Link: https://lkml.kernel.org/r/20230822231741.GC4509@monkey
Fixes: ebc1baf5c9b4 ("mm: free up a word in the first tail page")
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |   11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

--- a/mm/hugetlb.c~hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually
+++ a/mm/hugetlb.c
@@ -1484,6 +1484,7 @@ static void __destroy_compound_gigantic_
 
 	for (i = 1; i < nr_pages; i++) {
 		p = folio_page(folio, i);
+		p->flags &= ~PAGE_FLAGS_CHECK_AT_FREE;
 		p->mapping = NULL;
 		clear_compound_head(p);
 		if (!demote)
@@ -1702,8 +1703,6 @@ static void add_hugetlb_folio(struct hst
 static void __update_and_free_hugetlb_folio(struct hstate *h,
 						struct folio *folio)
 {
-	int i;
-	struct page *subpage;
 	bool clear_dtor = folio_test_hugetlb_vmemmap_optimized(folio);
 
 	if (hstate_is_gigantic(h) && !gigantic_page_runtime_supported())
@@ -1745,14 +1744,6 @@ static void __update_and_free_hugetlb_fo
 		spin_unlock_irq(&hugetlb_lock);
 	}
 
-	for (i = 0; i < pages_per_huge_page(h); i++) {
-		subpage = folio_page(folio, i);
-		subpage->flags &= ~(1 << PG_locked | 1 << PG_error |
-				1 << PG_referenced | 1 << PG_dirty |
-				1 << PG_active | 1 << PG_private |
-				1 << PG_writeback);
-	}
-
 	/*
 	 * Non-gigantic pages demoted from CMA allocated gigantic pages
 	 * need to be given back to CMA in free_gigantic_folio.
_

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

hugetlb-clear-flags-in-tail-pages-that-will-be-freed-individually.patch