linux-kernel - [PATCH] mm: compaction: remove incorrect #ifdef checks

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Date:   Wed, 29 Mar 2023 10:02:41 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Minghao Chi <chi.minghao@....com.cn>,
        Vlastimil Babka <vbabka@...e.cz>
Cc:     Arnd Bergmann <arnd@...db.de>, Miaohe Lin <linmiaohe@...wei.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        NARIBAYASHI Akira <a.naribayashi@...itsu.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: compaction: remove incorrect #ifdef checks

From: Arnd Bergmann <arnd@...db.de>

Without CONFIG_SYSCTL, the compiler warns about a few unused functions:

mm/compaction.c:3076:12: error: 'proc_dointvec_minmax_warn_RT_change' defined but not used [-Werror=unused-function]
mm/compaction.c:2780:12: error: 'sysctl_compaction_handler' defined but not used [-Werror=unused-function]
mm/compaction.c:2750:12: error: 'compaction_proactiveness_sysctl_handler' defined but not used [-Werror=unused-function]

The #ifdef is actually not necessary here, as the alternative
register_sysctl_init() stub function does not use its argument, which
lets the compiler drop the rest implicitly, while avoiding the warning.

Fixes: c521126610c3 ("mm: compaction: move compaction sysctl to its own file")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 mm/compaction.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 3dfdb84b9c98..c8bcdea15f5f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -3092,7 +3092,6 @@ static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
 	return ret;
 }
 
-#ifdef CONFIG_SYSCTL
 static struct ctl_table vm_compaction[] = {
 	{
 		.procname	= "compact_memory",
@@ -3130,7 +3129,6 @@ static struct ctl_table vm_compaction[] = {
 	},
 	{ }
 };
-#endif
 
 static int __init kcompactd_init(void)
 {
@@ -3147,9 +3145,7 @@ static int __init kcompactd_init(void)
 
 	for_each_node_state(nid, N_MEMORY)
 		kcompactd_run(nid);
-#ifdef CONFIG_SYSCTL
 	register_sysctl_init("vm", vm_compaction);
-#endif
 	return 0;
 }
 subsys_initcall(kcompactd_init)
-- 
2.39.2