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Commit 758338e9 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace 

Pull minor tracing updates and fixes from Steven Rostedt:
 "It seems that one of my old pull requests have slipped through.

  The changes are contained to just the files that I maintain, and are
  changes from others that I told I would get into this merge window.

  They have already been in linux-next for several weeks, and should be
  well tested."

* 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Remove unnecessary WARN_ONCE's from tracing_buffers_splice_read
  tracing: Remove unneeded checks from the stack tracer
  tracing: Add a resize function to make one buffer equivalent to another buffer
parents 224394ad bf3071f5

kernel/trace/trace.c

+31 −29
Original line number Diff line number Diff line
@@ -3034,6 +3034,31 @@ static void set_buffer_entries(struct trace_array *tr, unsigned long val) 
		tr->data[cpu]->entries = val;

}



/* resize @tr's buffer to the size of @size_tr's entries */

static int resize_buffer_duplicate_size(struct trace_array *tr,

					struct trace_array *size_tr, int cpu_id)

{

	int cpu, ret = 0;



	if (cpu_id == RING_BUFFER_ALL_CPUS) {

		for_each_tracing_cpu(cpu) {

			ret = ring_buffer_resize(tr->buffer,

					size_tr->data[cpu]->entries, cpu);

			if (ret < 0)

				break;

			tr->data[cpu]->entries = size_tr->data[cpu]->entries;

		}

	} else {

		ret = ring_buffer_resize(tr->buffer,

					size_tr->data[cpu_id]->entries, cpu_id);

		if (ret == 0)

			tr->data[cpu_id]->entries =

				size_tr->data[cpu_id]->entries;

	}



	return ret;

}



static int __tracing_resize_ring_buffer(unsigned long size, int cpu)

{

	int ret;
@@ -3058,23 +3083,8 @@ static int __tracing_resize_ring_buffer(unsigned long size, int cpu) 


	ret = ring_buffer_resize(max_tr.buffer, size, cpu);

	if (ret < 0) {

		int r = 0;



		if (cpu == RING_BUFFER_ALL_CPUS) {

			int i;

			for_each_tracing_cpu(i) {

				r = ring_buffer_resize(global_trace.buffer,

						global_trace.data[i]->entries,

						i);

				if (r < 0)

					break;

			}

		} else {

			r = ring_buffer_resize(global_trace.buffer,

						global_trace.data[cpu]->entries,

						cpu);

		}



		int r = resize_buffer_duplicate_size(&global_trace,

						     &global_trace, cpu);

		if (r < 0) {

			/*

			 * AARGH! We are left with different
@@ -3212,17 +3222,11 @@ static int tracing_set_tracer(const char *buf) 


	topts = create_trace_option_files(t);

	if (t->use_max_tr) {

		int cpu;

		/* we need to make per cpu buffer sizes equivalent */

		for_each_tracing_cpu(cpu) {

			ret = ring_buffer_resize(max_tr.buffer,

						global_trace.data[cpu]->entries,

						cpu);

		ret = resize_buffer_duplicate_size(&max_tr, &global_trace,

						   RING_BUFFER_ALL_CPUS);

		if (ret < 0)

			goto out;

			max_tr.data[cpu]->entries =

					global_trace.data[cpu]->entries;

		}

	}



	if (t->init) {
@@ -4271,13 +4275,11 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos, 
		return -ENOMEM;



	if (*ppos & (PAGE_SIZE - 1)) {

		WARN_ONCE(1, "Ftrace: previous read must page-align\n");

		ret = -EINVAL;

		goto out;

	}



	if (len & (PAGE_SIZE - 1)) {

		WARN_ONCE(1, "Ftrace: splice_read should page-align\n");

		if (len < PAGE_SIZE) {

			ret = -EINVAL;

			goto out;

kernel/trace/trace_stack.c

+0 −4
Original line number Diff line number Diff line
@@ -33,7 +33,6 @@ static unsigned long max_stack_size; 
static arch_spinlock_t max_stack_lock =

	(arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;



static int stack_trace_disabled __read_mostly;

static DEFINE_PER_CPU(int, trace_active);

static DEFINE_MUTEX(stack_sysctl_mutex);
@@ -116,9 +115,6 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip, 
{

	int cpu;



	if (unlikely(!ftrace_enabled || stack_trace_disabled))

		return;



	preempt_disable_notrace();



	cpu = raw_smp_processor_id();