+ mm-hugetlb-make-detecting-shared-pte-more-reliable-fix.patch added to mm-unstable branch

+ mm-hugetlb-make-detecting-shared-pte-more-reliable-fix.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/hugetlb: remove unused local variable dst_entry in copy_hugetlb_page_range()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-hugetlb-make-detecting-shared-pte-more-reliable-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-make-detecting-shared-pte-more-reliable-fix.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: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Subject: mm/hugetlb: remove unused local variable dst_entry in copy_hugetlb_page_range()
Date: Mon, 22 Aug 2022 10:25:25 +0200

Commit a0e4f7b82610 ("mm/hugetlb: make detecting shared pte more
reliable") modifies copy_hugetlb_page_range() such that
huge_ptep_get(dst_pte) and the local variable dst_entry is not used
explicitly in this function.

Remove this unused local variable dst_entry in copy_hugetlb_page_range().
No functional change.

Link: https://lkml.kernel.org/r/20220822082525.26071-1-lukas.bulwahn@gmail.com
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/mm/hugetlb.c~mm-hugetlb-make-detecting-shared-pte-more-reliable-fix
+++ a/mm/hugetlb.c
@@ -4750,7 +4750,7 @@ int copy_hugetlb_page_range(struct mm_st
 			    struct vm_area_struct *dst_vma,
 			    struct vm_area_struct *src_vma)
 {
-	pte_t *src_pte, *dst_pte, entry, dst_entry;
+	pte_t *src_pte, *dst_pte, entry;
 	struct page *ptepage;
 	unsigned long addr;
 	bool cow = is_cow_mapping(src_vma->vm_flags);
@@ -4810,7 +4810,6 @@ int copy_hugetlb_page_range(struct mm_st
 		src_ptl = huge_pte_lockptr(h, src, src_pte);
 		spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
 		entry = huge_ptep_get(src_pte);
-		dst_entry = huge_ptep_get(dst_pte);
 again:
 		if (huge_pte_none(entry)) {
 			/*
@@ -4893,7 +4892,7 @@ again:
 					restore_reserve_on_error(h, dst_vma, addr,
 								new);
 					put_page(new);
-					/* dst_entry won't change as in child */
+					/* huge_ptep of dst_pte won't change as in child */
 					goto again;
 				}
 				hugetlb_install_page(dst_vma, dst_pte, addr, new);
_

Patches currently in -mm which might be from lukas.bulwahn@gmail.com are

mm-hugetlb-make-detecting-shared-pte-more-reliable-fix.patch