linux-kernel - [PATCH 1/2] mm/damon/vaddr: constify static mm_walk

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Date:   Thu, 14 Oct 2021 09:50:41 +0200
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Rikard Falkeborn <rikard.falkeborn@...il.com>
Subject: [PATCH 1/2] mm/damon/vaddr: constify static mm_walk_ops

The only usage of these structs is to pass their addresses to
walk_page_range(), which takes a pointer to const mm_walk_ops as
argument. Make them const to allow the compiler to put them in
read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
---
 mm/damon/vaddr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 953c145b4f08..65d4f115fa66 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -476,7 +476,7 @@ static int damon_mkold_pmd_entry(pmd_t *pmd, unsigned long addr,
 	return 0;
 }
 
-static struct mm_walk_ops damon_mkold_ops = {
+static const struct mm_walk_ops damon_mkold_ops = {
 	.pmd_entry = damon_mkold_pmd_entry,
 };
 
@@ -572,7 +572,7 @@ static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
 	return 0;
 }
 
-static struct mm_walk_ops damon_young_ops = {
+static const struct mm_walk_ops damon_young_ops = {
 	.pmd_entry = damon_young_pmd_entry,
 };
 
-- 
2.33.0