+ mm-hugetlb-remove-unnecessary-huge_ptep_set_access_flags-in-hugetlb_mcopy_atomic_pte.patch added to mm-unstable branch

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

The patch titled
     Subject: mm/hugetlb: remove unnecessary huge_ptep_set_access_flags() in hugetlb_mcopy_atomic_pte()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-hugetlb-remove-unnecessary-huge_ptep_set_access_flags-in-hugetlb_mcopy_atomic_pte.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-remove-unnecessary-huge_ptep_set_access_flags-in-hugetlb_mcopy_atomic_pte.patch

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

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------------------------------------------------------
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm/hugetlb: remove unnecessary huge_ptep_set_access_flags() in hugetlb_mcopy_atomic_pte()
Date: Fri, 27 May 2022 10:01:35 +0800

There is no need to update the hugetlb access flags after just setting the
hugetlb page table entry by set_huge_pte_at(), since the page table entry
value has no changes.

Thus remove the unnecessary huge_ptep_set_access_flags() in
hugetlb_mcopy_atomic_pte().

Link: https://lkml.kernel.org/r/f3e28b897b53a69967a8b98a6fdcda3be80c9229.1653616175.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/hugetlb.c~mm-hugetlb-remove-unnecessary-huge_ptep_set_access_flags-in-hugetlb_mcopy_atomic_pte
+++ a/mm/hugetlb.c
@@ -6031,8 +6031,6 @@ int hugetlb_mcopy_atomic_pte(struct mm_s
 
 	set_huge_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
 
-	(void)huge_ptep_set_access_flags(dst_vma, dst_addr, dst_pte, _dst_pte,
-					dst_vma->vm_flags & VM_WRITE);
 	hugetlb_count_add(pages_per_huge_page(h), dst_mm);
 
 	/* No need to invalidate - it was non-present before */
_

Patches currently in -mm which might be from baolin.wang@linux.alibaba.com are

mm-hugetlb-remove-unnecessary-huge_ptep_set_access_flags-in-hugetlb_mcopy_atomic_pte.patch