linux-kernel - [PATCH] mm: hugetlb_vmemmap: simplify hugetlb_vmemmap

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Message-Id: <20230223065947.64134-1-songmuchun@bytedance.com>
Date:   Thu, 23 Feb 2023 14:59:47 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        muchun.song@...ux.dev
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH] mm: hugetlb_vmemmap: simplify hugetlb_vmemmap_init() a bit

The check of IS_ENABLED(CONFIG_PROC_SYSCTL) is unnecessary since
register_sysctl_init() will be empty in this case. So, there is
no warnings after removing the check.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
 mm/hugetlb_vmemmap.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index 45e93a545dd7..274b91d408c3 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -590,17 +590,15 @@ static struct ctl_table hugetlb_vmemmap_sysctls[] = {
 
 static int __init hugetlb_vmemmap_init(void)
 {
+	const struct hstate *h;
+
 	/* HUGETLB_VMEMMAP_RESERVE_SIZE should cover all used struct pages */
 	BUILD_BUG_ON(__NR_USED_SUBPAGE * sizeof(struct page) > HUGETLB_VMEMMAP_RESERVE_SIZE);
 
-	if (IS_ENABLED(CONFIG_PROC_SYSCTL)) {
-		const struct hstate *h;
-
-		for_each_hstate(h) {
-			if (hugetlb_vmemmap_optimizable(h)) {
-				register_sysctl_init("vm", hugetlb_vmemmap_sysctls);
-				break;
-			}
+	for_each_hstate(h) {
+		if (hugetlb_vmemmap_optimizable(h)) {
+			register_sysctl_init("vm", hugetlb_vmemmap_sysctls);
+			break;
 		}
 	}
 	return 0;
-- 
2.11.0