linux-kernel - [PATCH v3 4/5] stack_tracer: move sysctl registration to kernel/trace/trace

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Message-Id: <20250313-jag-mv_ctltables-v3-4-91f3bb434d27@kernel.org>
Date: Thu, 13 Mar 2025 17:22:26 +0100
From: Joel Granados <joel.granados@...nel.org>
To: Kees Cook <kees@...nel.org>, Joel Granados <joel.granados@...nel.org>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 linux-trace-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: [PATCH v3 4/5] stack_tracer: move sysctl registration to
 kernel/trace/trace_stack.c

Move stack_tracer_enabled into trace_stack_sysctl_table. This is part of
a greater effort to move ctl tables into their respective subsystems
which will reduce the merge conflicts in kerenel/sysctl.c.

Signed-off-by: Joel Granados <joel.granados@...nel.org>
---
 include/linux/ftrace.h     |  2 --
 kernel/sysctl.c            | 10 ----------
 kernel/trace/trace_stack.c | 22 +++++++++++++++++++++-
 3 files changed, 21 insertions(+), 13 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 59774513ae456a5cc7c3bfe7f93a2189c0e3706e..95851a6fb9429346e279739be0045827f486cbad 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -569,8 +569,6 @@ static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs,
 
 #ifdef CONFIG_STACK_TRACER
 
-extern int stack_tracer_enabled;
-
 int stack_trace_sysctl(const struct ctl_table *table, int write, void *buffer,
 		       size_t *lenp, loff_t *ppos);
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index baa250e223a26bafc39cb7a7d7635b4f7f5dcf56..dc3747cc72d470662879e4f2b7f2651505b7ca90 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -68,7 +68,6 @@
 
 #ifdef CONFIG_X86
 #include <asm/nmi.h>
-#include <asm/stacktrace.h>
 #include <asm/io.h>
 #endif
 #ifdef CONFIG_SPARC
@@ -1674,15 +1673,6 @@ static const struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#ifdef CONFIG_STACK_TRACER
-	{
-		.procname	= "stack_tracer_enabled",
-		.data		= &stack_tracer_enabled,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= stack_trace_sysctl,
-	},
-#endif
 #ifdef CONFIG_MODULES
 	{
 		.procname	= "modprobe",
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 14c6f272c4d8a382070d45e1cf0ee97db38831c9..e34223c8065de544e603440827bcaa76e1894df2 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -32,7 +32,7 @@ static arch_spinlock_t stack_trace_max_lock =
 DEFINE_PER_CPU(int, disable_stack_tracer);
 static DEFINE_MUTEX(stack_sysctl_mutex);
 
-int stack_tracer_enabled;
+static int stack_tracer_enabled;
 
 static void print_max_stack(void)
 {
@@ -578,3 +578,23 @@ static __init int stack_trace_init(void)
 }
 
 device_initcall(stack_trace_init);
+
+
+static const struct ctl_table trace_stack_sysctl_table[] = {
+	{
+		.procname	= "stack_tracer_enabled",
+		.data		= &stack_tracer_enabled,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= stack_trace_sysctl,
+	},
+};
+
+static int __init init_trace_stack_sysctls(void)
+{
+	register_sysctl_init("kernel", trace_stack_sysctl_table);
+	return 0;
+}
+subsys_initcall(init_trace_stack_sysctls);
+
+

-- 
2.47.2