linux-kernel - [PATCH] mm/hugetlb: remove unused local variable dst_entry in copy_hugetlb_page

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Date:   Mon, 22 Aug 2022 10:25:25 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] mm/hugetlb: remove unused local variable dst_entry in copy_hugetlb_page_range()

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.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
 mm/hugetlb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9a72499486c1..6c00ba1dde32 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4763,7 +4763,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 			    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);
@@ -4823,7 +4823,6 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 		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)) {
 			/*
@@ -4906,7 +4905,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 					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);
-- 
2.17.1