@@ -392,12 +392,6 @@ static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs,
#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
#ifdef CONFIG_STACK_TRACER
-
-extern int stack_tracer_enabled;
-
-int stack_trace_sysctl(struct ctl_table *table, int write, void *buffer,
- size_t *lenp, loff_t *ppos);
-
/* DO NOT MODIFY THIS VARIABLE DIRECTLY! */
DECLARE_PER_CPU(int, disable_stack_tracer);
@@ -1755,15 +1755,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = ftrace_enable_sysctl,
},
#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_TRACING
{
.procname = "ftrace_dump_on_oops",
@@ -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)
{
@@ -513,7 +513,8 @@ static const struct file_operations stack_trace_filter_fops = {
#endif /* CONFIG_DYNAMIC_FTRACE */
-int
+#ifdef CONFIG_SYSCTL
+static int
stack_trace_sysctl(struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
@@ -537,6 +538,25 @@ stack_trace_sysctl(struct ctl_table *table, int write, void *buffer,
return ret;
}
+static struct ctl_table kern_trace_stack_table[] = {
+ {
+ .procname = "stack_tracer_enabled",
+ .data = &stack_tracer_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = stack_trace_sysctl,
+ },
+ { }
+};
+
+static void __init kernel_trace_stack_sysctls_init(void)
+{
+ register_sysctl_init("kernel", kern_trace_stack_table);
+}
+#else
+#define kernel_trace_stack_sysctls_init() do { } while (0)
+#endif /* CONFIG_SYSCTL */
+
static char stack_trace_filter_buf[COMMAND_LINE_SIZE+1] __initdata;
static __init int enable_stacktrace(char *str)
@@ -576,6 +596,8 @@ static __init int stack_trace_init(void)
if (stack_tracer_enabled)
register_ftrace_function(&trace_ops);
+ kernel_trace_stack_sysctls_init();
+
return 0;
}
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty dishes, this makes it very difficult to maintain. To help with this maintenance let's start by moving sysctls to places where they actually belong. The proc sysctl maintainers do not want to know what sysctl knobs you wish to add for your own piece of code, we just care about the core logic. All filesystem syctls now get reviewed by fs folks. This commit follows the commit of fs, move the stack_tracer_enabled sysctl to its own file, kernel/trace/trace_stack.c. Signed-off-by: tangmeng <tangmeng@uniontech.com> --- include/linux/ftrace.h | 6 ------ kernel/sysctl.c | 9 --------- kernel/trace/trace_stack.c | 26 ++++++++++++++++++++++++-- 3 files changed, 24 insertions(+), 17 deletions(-)