+ mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm/hugetlb: remove redundant check in preparing and destroying gigantic page
has been added to the -mm tree.  Its filename is
     mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page.patch

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------------------------------------------------------
From: Yanfei Xu <yanfei.xu@windriver.com>
Subject: mm/hugetlb: remove redundant check in preparing and destroying gigantic page

Gigantic page is a compound page and its order is more than 1.  Thus it
must be available for hpage_pincount.  Let's remove the redundant check
for gigantic page.

Link: https://lkml.kernel.org/r/20210202112002.73170-1-yanfei.xu@windriver.com
Signed-off-by: Yanfei Xu <yanfei.xu@windriver.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/mm/hugetlb.c~mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page
+++ a/mm/hugetlb.c
@@ -1234,8 +1234,7 @@ static void destroy_compound_gigantic_pa
 	struct page *p = page + 1;
 
 	atomic_set(compound_mapcount_ptr(page), 0);
-	if (hpage_pincount_available(page))
-		atomic_set(compound_pincount_ptr(page), 0);
+	atomic_set(compound_pincount_ptr(page), 0);
 
 	for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
 		clear_compound_head(p);
@@ -1563,9 +1562,7 @@ static void prep_compound_gigantic_page(
 		set_compound_head(p, page);
 	}
 	atomic_set(compound_mapcount_ptr(page), -1);
-
-	if (hpage_pincount_available(page))
-		atomic_set(compound_pincount_ptr(page), 0);
+	atomic_set(compound_pincount_ptr(page), 0);
 }
 
 /*
_

Patches currently in -mm which might be from yanfei.xu@windriver.com are

mm-hugetlb-remove-redundant-check-in-preparing-and-destroying-gigantic-page.patch