On Tue, 18 Feb 2025 10:56:19 +0100 Joel Granados <[email protected]> wrote:
Nit, change the subject to: tracing: Move trace sysctls into trace.c as I try to only have the "ftrace:" label for modifications that affect attaching to functions, and "tracing:" for everything else. Acked-by: Steven Rostedt (Google) <[email protected]> -- Steve > 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 <[email protected]> > --- > 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 */ >
