Merge branch 'tracing/ftrace' into auto-ftrace-next (6712e299) · Commits · e / devices / android_kernel_oneplus_sm7250

include/linux/ftrace.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,7 @@ void ftrace_enable_daemon(void);

		/* totally disable ftrace - can not re-enable after this */
		void ftrace_kill(void);
		void ftrace_kill_atomic(void);

		static inline void tracer_disable(void)
		{

kernel/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -11,7 +11,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
		hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
		notifier.o ksysfs.o pm_qos_params.o sched_clock.o

		CFLAGS_REMOVE_sched.o = -pg -mno-spe
		CFLAGS_REMOVE_sched.o = -mno-spe

		ifdef CONFIG_FTRACE
		# Do not trace debug files and internal ftrace files

kernel/trace/ftrace.c

+17 −0

Original line number	Diff line number	Diff line
		@@ -1601,6 +1601,23 @@ core_initcall(ftrace_dynamic_init);
		# define ftrace_force_shutdown() do { } while (0)
		#endif /* CONFIG_DYNAMIC_FTRACE */

		/**
		* ftrace_kill_atomic - kill ftrace from critical sections
		*
		* This function should be used by panic code. It stops ftrace
		* but in a not so nice way. If you need to simply kill ftrace
		* from a non-atomic section, use ftrace_kill.
		*/
		void ftrace_kill_atomic(void)
		{
		ftrace_disabled = 1;
		ftrace_enabled = 0;
		#ifdef CONFIG_DYNAMIC_FTRACE
		ftraced_suspend = -1;
		#endif
		clear_ftrace_function();
		}

		/**
		* ftrace_kill - totally shutdown ftrace
		*

kernel/trace/trace.c

+20 −4

Original line number	Diff line number	Diff line
		@@ -96,6 +96,9 @@ static DEFINE_PER_CPU(struct trace_array_cpu, max_data);
		/* tracer_enabled is used to toggle activation of a tracer */
		static int tracer_enabled = 1;

		/* function tracing enabled */
		int ftrace_function_enabled;

		/*
		* trace_nr_entries is the number of entries that is allocated
		* for a buffer. Note, the number of entries is always rounded
		@@ -134,6 +137,7 @@ static notrace void no_trace_init(struct trace_array *tr)
		{
		int cpu;

		ftrace_function_enabled = 0;
		if(tr->ctrl)
		for_each_online_cpu(cpu)
		tracing_reset(tr->data[cpu]);
		@@ -1027,7 +1031,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
		long disabled;
		int cpu;

		if (unlikely(!tracer_enabled))
		if (unlikely(!ftrace_function_enabled))
		return;

		if (skip_trace(ip))
		@@ -1052,11 +1056,15 @@ static struct ftrace_ops trace_ops __read_mostly =

		void tracing_start_function_trace(void)
		{
		ftrace_function_enabled = 0;
		register_ftrace_function(&trace_ops);
		if (tracer_enabled)
		ftrace_function_enabled = 1;
		}

		void tracing_stop_function_trace(void)
		{
		ftrace_function_enabled = 0;
		unregister_ftrace_function(&trace_ops);
		}
		#endif
		@@ -1383,7 +1391,7 @@ print_trace_header(struct seq_file m, struct trace_iterator iter)
		"server",
		#elif defined(CONFIG_PREEMPT_VOLUNTARY)
		"desktop",
		#elif defined(CONFIG_PREEMPT_DESKTOP)
		#elif defined(CONFIG_PREEMPT)
		"preempt",
		#else
		"unknown",
		@@ -1892,8 +1900,10 @@ __tracing_open(struct inode inode, struct file file, int *ret)
		m->private = iter;

		/* stop the trace while dumping */
		if (iter->tr->ctrl)
		if (iter->tr->ctrl) {
		tracer_enabled = 0;
		ftrace_function_enabled = 0;
		}

		if (iter->trace && iter->trace->open)
		iter->trace->open(iter);
		@@ -1926,8 +1936,14 @@ int tracing_release(struct inode inode, struct file file)
		iter->trace->close(iter);

		/* reenable tracing if it was previously enabled */
		if (iter->tr->ctrl)
		if (iter->tr->ctrl) {
		tracer_enabled = 1;
		/*
		* It is safe to enable function tracing even if it
		* isn't used
		*/
		ftrace_function_enabled = 1;
		}
		mutex_unlock(&trace_types_lock);

		seq_release(inode, file);

kernel/trace/trace.h

+8 −2

Original line number	Diff line number	Diff line
		@@ -223,8 +223,6 @@ void trace_function(struct trace_array *tr,
		unsigned long parent_ip,
		unsigned long flags);

		void tracing_start_function_trace(void);
		void tracing_stop_function_trace(void);
		void tracing_start_cmdline_record(void);
		void tracing_stop_cmdline_record(void);
		int register_tracer(struct tracer *type);
		@@ -241,6 +239,14 @@ void update_max_tr_single(struct trace_array *tr,

		extern cycle_t ftrace_now(int cpu);

		#ifdef CONFIG_FTRACE
		void tracing_start_function_trace(void);
		void tracing_stop_function_trace(void);
		#else
		# define tracing_start_function_trace() do { } while (0)
		# define tracing_stop_function_trace() do { } while (0)
		#endif

		#ifdef CONFIG_CONTEXT_SWITCH_TRACER
		typedef void
		(tracer_switch_func_t)(void private,