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Message-Id: <20250218-jag-mv_ctltables-v1-3-cd3698ab8d29@kernel.org>
Date: Tue, 18 Feb 2025 10:56:19 +0100
From: Joel Granados <joel.granados@...nel.org>
To: Kees Cook <kees@...nel.org>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
"David S. Miller" <davem@...emloft.net>,
Andreas Larsson <andreas@...sler.com>, Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Sven Schnelle <svens@...ux.ibm.com>,
Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, "Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
sparclinux@...r.kernel.org, linux-s390@...r.kernel.org,
linux-acpi@...r.kernel.org, Joel Granados <joel.granados@...nel.org>
Subject: [PATCH 3/8] ftrace: Move trace sysctls into trace.c
Move trace ctl tables into their own const array in
kernel/trace/trace.c. The sysctl table register is called with
subsys_initcall placing if after its original place in proc_root_init.
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 | 7 -------
kernel/sysctl.c | 24 ------------------------
kernel/trace/trace.c | 36 +++++++++++++++++++++++++++++++++++-
3 files changed, 35 insertions(+), 32 deletions(-)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index fbabc3d848b3..59774513ae45 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1298,16 +1298,9 @@ static inline void unpause_graph_tracing(void) { }
#ifdef CONFIG_TRACING
enum ftrace_dump_mode;
-#define MAX_TRACER_SIZE 100
-extern char ftrace_dump_on_oops[];
extern int ftrace_dump_on_oops_enabled(void);
-extern int tracepoint_printk;
extern void disable_trace_on_warning(void);
-extern int __disable_trace_on_warning;
-
-int tracepoint_printk_sysctl(const struct ctl_table *table, int write,
- void *buffer, size_t *lenp, loff_t *ppos);
#else /* CONFIG_TRACING */
static inline void disable_trace_on_warning(void) { }
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 6514c13800a4..baa250e223a2 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -51,7 +51,6 @@
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
#include <linux/reboot.h>
-#include <linux/ftrace.h>
#include <linux/perf_event.h>
#include <linux/oom.h>
#include <linux/kmod.h>
@@ -1684,29 +1683,6 @@ static const struct ctl_table kern_table[] = {
.proc_handler = stack_trace_sysctl,
},
#endif
-#ifdef CONFIG_TRACING
- {
- .procname = "ftrace_dump_on_oops",
- .data = &ftrace_dump_on_oops,
- .maxlen = MAX_TRACER_SIZE,
- .mode = 0644,
- .proc_handler = proc_dostring,
- },
- {
- .procname = "traceoff_on_warning",
- .data = &__disable_trace_on_warning,
- .maxlen = sizeof(__disable_trace_on_warning),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "tracepoint_printk",
- .data = &tracepoint_printk,
- .maxlen = sizeof(tracepoint_printk),
- .mode = 0644,
- .proc_handler = tracepoint_printk_sysctl,
- },
-#endif
#ifdef CONFIG_MODULES
{
.procname = "modprobe",
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0e6d517e74e0..abfc0e56173b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -117,6 +117,7 @@ static int tracing_disabled = 1;
cpumask_var_t __read_mostly tracing_buffer_mask;
+#define MAX_TRACER_SIZE 100
/*
* ftrace_dump_on_oops - variable to dump ftrace buffer on oops
*
@@ -139,7 +140,40 @@ cpumask_var_t __read_mostly tracing_buffer_mask;
char ftrace_dump_on_oops[MAX_TRACER_SIZE] = "0";
/* When set, tracing will stop when a WARN*() is hit */
-int __disable_trace_on_warning;
+static int __disable_trace_on_warning;
+
+int tracepoint_printk_sysctl(const struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos);
+static const struct ctl_table trace_sysctl_table[] = {
+ {
+ .procname = "ftrace_dump_on_oops",
+ .data = &ftrace_dump_on_oops,
+ .maxlen = MAX_TRACER_SIZE,
+ .mode = 0644,
+ .proc_handler = proc_dostring,
+ },
+ {
+ .procname = "traceoff_on_warning",
+ .data = &__disable_trace_on_warning,
+ .maxlen = sizeof(__disable_trace_on_warning),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tracepoint_printk",
+ .data = &tracepoint_printk,
+ .maxlen = sizeof(tracepoint_printk),
+ .mode = 0644,
+ .proc_handler = tracepoint_printk_sysctl,
+ },
+};
+
+static int __init init_trace_sysctls(void)
+{
+ register_sysctl_init("kernel", trace_sysctl_table);
+ return 0;
+}
+subsys_initcall(init_trace_sysctls);
#ifdef CONFIG_TRACE_EVAL_MAP_FILE
/* Map of enums to their values, for "eval_map" file */
--
2.44.2
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