Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (105 commits)
  ring-buffer: only enable ring_buffer_swap_cpu when needed
  ring-buffer: check for swapped buffers in start of committing
  tracing: report error in trace if we fail to swap latency buffer
  tracing: add trace_array_printk for internal tracers to use
  tracing: pass around ring buffer instead of tracer
  tracing: make tracing_reset safe for external use
  tracing: use timestamp to determine start of latency traces
  tracing: Remove mentioning of legacy latency_trace file from documentation
  tracing/filters: Defer pred allocation, fix memory leak
  tracing: remove users of tracing_reset
  tracing: disable buffers and synchronize_sched before resetting
  tracing: disable update max tracer while reading trace
  tracing: print out start and stop in latency traces
  ring-buffer: disable all cpu buffers when one finds a problem
  ring-buffer: do not count discarded events
  ring-buffer: remove ring_buffer_event_discard
  ring-buffer: fix ring_buffer_read crossing pages
  ring-buffer: remove unnecessary cpu_relax
  ring-buffer: do not swap buffers during a commit
  ring-buffer: do not reset while in a commit
  ...

1 files changed, 13 insertions, 30 deletions

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 6a2a9d484cd6..0f6facb050a1 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -186,43 +186,33 @@ static const struct file_operations stack_max_size_fops = {
 };
 
 static void *
-t_next(struct seq_file *m, void *v, loff_t *pos)
+__next(struct seq_file *m, loff_t *pos)
 {
-        long i;
+        long n = *pos - 1;
 
-        (*pos)++;
-
-        if (v == SEQ_START_TOKEN)
-                i = 0;
-        else {
-                i = *(long *)v;
-                i++;
-        }
-
-        if (i >= max_stack_trace.nr_entries ||
-            stack_dump_trace[i] == ULONG_MAX)
+        if (n >= max_stack_trace.nr_entries || stack_dump_trace[n] == ULONG_MAX)
                 return NULL;
 
-        m->private = (void *)i;
-
+        m->private = (void *)n;
         return &m->private;
 }
 
-static void *t_start(struct seq_file *m, loff_t *pos)
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        void *t = SEQ_START_TOKEN;
-        loff_t l = 0;
+        (*pos)++;
+        return __next(m, pos);
+}
 
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
         local_irq_disable();
         __raw_spin_lock(&max_stack_lock);
 
         if (*pos == 0)
                 return SEQ_START_TOKEN;
 
-        for (; t && l < *pos; t = t_next(m, t, &l))
-                ;
-
-        return t;
+        return __next(m, pos);
 }
 
 static void t_stop(struct seq_file *m, void *p)
@@ -234,15 +224,8 @@ static void t_stop(struct seq_file *m, void *p)
 static int trace_lookup_stack(struct seq_file *m, long i)
 {
         unsigned long addr = stack_dump_trace[i];
-#ifdef CONFIG_KALLSYMS
-        char str[KSYM_SYMBOL_LEN];
-
-        sprint_symbol(str, addr);
 
-        return seq_printf(m, "%s\n", str);
-#else
-        return seq_printf(m, "%p\n", (void*)addr);
-#endif
+        return seq_printf(m, "%pF\n", (void *)addr);
 }
 
 static void print_disabled(struct seq_file *m)