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Commit 08cd2a69 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge branch 'tip/perf/urgent-2' of... 

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

 into perf/urgent

Pull ftrace fixes from Steve Rostedt.

Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents fd6da696 9366c1ba

kernel/trace/ftrace.c

+1 −1
Original line number Diff line number Diff line
@@ -2437,7 +2437,7 @@ static void reset_iter_read(struct ftrace_iterator *iter) 
{

	iter->pos = 0;

	iter->func_pos = 0;

	iter->flags &= ~(FTRACE_ITER_PRINTALL & FTRACE_ITER_HASH);

	iter->flags &= ~(FTRACE_ITER_PRINTALL | FTRACE_ITER_HASH);

}



static void *t_start(struct seq_file *m, loff_t *pos)

kernel/trace/ring_buffer.c

+13 −3
Original line number Diff line number Diff line
@@ -1396,6 +1396,8 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer) 
		struct list_head *head_page_with_bit;



		head_page = &rb_set_head_page(cpu_buffer)->list;

		if (!head_page)

			break;

		prev_page = head_page->prev;



		first_page = pages->next;
@@ -2934,7 +2936,7 @@ unsigned long ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu) 
	unsigned long flags;

	struct ring_buffer_per_cpu *cpu_buffer;

	struct buffer_page *bpage;

	unsigned long ret;

	unsigned long ret = 0;



	if (!cpumask_test_cpu(cpu, buffer->cpumask))

		return 0;
@@ -2949,6 +2951,7 @@ unsigned long ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu) 
		bpage = cpu_buffer->reader_page;

	else

		bpage = rb_set_head_page(cpu_buffer);

	if (bpage)

		ret = bpage->page->time_stamp;

	raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
@@ -3260,6 +3263,8 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer) 
	 * Splice the empty reader page into the list around the head.

	 */

	reader = rb_set_head_page(cpu_buffer);

	if (!reader)

		goto out;

	cpu_buffer->reader_page->list.next = rb_list_head(reader->list.next);

	cpu_buffer->reader_page->list.prev = reader->list.prev;
@@ -3778,12 +3783,17 @@ void 
ring_buffer_read_finish(struct ring_buffer_iter *iter)

{

	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;

	unsigned long flags;



	/*

	 * Ring buffer is disabled from recording, here's a good place

	 * to check the integrity of the ring buffer.

	 * Must prevent readers from trying to read, as the check

	 * clears the HEAD page and readers require it.

	 */

	raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);

	rb_check_pages(cpu_buffer);

	raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);



	atomic_dec(&cpu_buffer->record_disabled);

	atomic_dec(&cpu_buffer->buffer->resize_disabled);