linux-kernel - [PATCH v2] mm: memory-failure: Move memory failure sysctls to its own file

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Date:   Fri, 10 Mar 2023 11:57:09 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v2] mm: memory-failure: Move memory failure sysctls to its own file

The sysctl_memory_failure_early_kill and memory_failure_recovery
are only used in memory-failure.c, move them to its own file.

Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
v2: add Ack and do not initialise statics to 0
 include/linux/mm.h  |  2 --
 kernel/sysctl.c     | 20 --------------------
 mm/memory-failure.c | 35 +++++++++++++++++++++++++++++++++--
 3 files changed, 33 insertions(+), 24 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ce1590933995..4765aedee1d4 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3587,8 +3587,6 @@ int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
 extern int memory_failure(unsigned long pfn, int flags);
 extern void memory_failure_queue_kick(int cpu);
 extern int unpoison_memory(unsigned long pfn);
-extern int sysctl_memory_failure_early_kill;
-extern int sysctl_memory_failure_recovery;
 extern void shake_page(struct page *p);
 extern atomic_long_t num_poisoned_pages __read_mostly;
 extern int soft_offline_page(unsigned long pfn, int flags);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ce0297acf97c..0a8a3c9c82e4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2350,26 +2350,6 @@ static struct ctl_table vm_table[] = {
 		.proc_handler	= proc_dointvec,
 		.extra1		= SYSCTL_ZERO,
 	},
-#endif
-#ifdef CONFIG_MEMORY_FAILURE
-	{
-		.procname	= "memory_failure_early_kill",
-		.data		= &sysctl_memory_failure_early_kill,
-		.maxlen		= sizeof(sysctl_memory_failure_early_kill),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_ONE,
-	},
-	{
-		.procname	= "memory_failure_recovery",
-		.data		= &sysctl_memory_failure_recovery,
-		.maxlen		= sizeof(sysctl_memory_failure_recovery),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_ONE,
-	},
 #endif
 	{
 		.procname	= "user_reserve_kbytes",
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index fae9baf3be16..6c007b7730fe 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -62,13 +62,14 @@
 #include <linux/page-isolation.h>
 #include <linux/pagewalk.h>
 #include <linux/shmem_fs.h>
+#include <linux/sysctl.h>
 #include "swap.h"
 #include "internal.h"
 #include "ras/ras_event.h"
 
-int sysctl_memory_failure_early_kill __read_mostly = 0;
+static int sysctl_memory_failure_early_kill __read_mostly;
 
-int sysctl_memory_failure_recovery __read_mostly = 1;
+static int sysctl_memory_failure_recovery __read_mostly = 1;
 
 atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);
 
@@ -122,6 +123,36 @@ const struct attribute_group memory_failure_attr_group = {
 	.attrs = memory_failure_attr,
 };
 
+#ifdef CONFIG_SYSCTL
+static struct ctl_table memory_failure_table[] = {
+	{
+		.procname	= "memory_failure_early_kill",
+		.data		= &sysctl_memory_failure_early_kill,
+		.maxlen		= sizeof(sysctl_memory_failure_early_kill),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "memory_failure_recovery",
+		.data		= &sysctl_memory_failure_recovery,
+		.maxlen		= sizeof(sysctl_memory_failure_recovery),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+};
+
+static int __init memory_failure_sysctl_init(void)
+{
+	register_sysctl_init("vm", memory_failure_table);
+	return 0;
+}
+late_initcall(memory_failure_sysctl_init);
+#endif /* CONFIG_SYSCTL */
+
 /*
  * Return values:
  *   1:   the page is dissolved (if needed) and taken off from buddy,
-- 
2.35.3