1 files changed, 69 insertions, 22 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 2d4d185cd0d8..66ea23b64fe6 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -14,6 +14,11 @@
 #include "trace.h"
 #include "trace_output.h"
 
+struct fgraph_data {
+        pid_t           last_pid;
+        int             depth;
+};
+
 #define TRACE_GRAPH_INDENT      2
 
 /* Flag options */
@@ -231,16 +236,16 @@ print_graph_proc(struct trace_seq *s, pid_t pid)
 
 /* If the pid changed since the last trace, output this event */
 static enum print_line_t
-verif_pid(struct trace_seq *s, pid_t pid, int cpu, pid_t *last_pids_cpu)
+verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
 {
         pid_t prev_pid;
         pid_t *last_pid;
         int ret;
 
-        if (!last_pids_cpu)
+        if (!data)
                 return TRACE_TYPE_HANDLED;
 
-        last_pid = per_cpu_ptr(last_pids_cpu, cpu);
+        last_pid = &(per_cpu_ptr(data, cpu)->last_pid);
 
         if (*last_pid == pid)
                 return TRACE_TYPE_HANDLED;
@@ -471,6 +476,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
                 struct ftrace_graph_ent_entry *entry,
                 struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s)
 {
+        struct fgraph_data *data = iter->private;
         struct ftrace_graph_ret *graph_ret;
         struct ftrace_graph_ent *call;
         unsigned long long duration;
@@ -481,6 +487,18 @@ print_graph_entry_leaf(struct trace_iterator *iter,
         call = &entry->graph_ent;
         duration = graph_ret->rettime - graph_ret->calltime;
 
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+                /*
+                 * Comments display at + 1 to depth. Since
+                 * this is a leaf function, keep the comments
+                 * equal to this depth.
+                 */
+                *depth = call->depth - 1;
+        }
+
         /* Overhead */
         ret = print_graph_overhead(duration, s);
         if (!ret)
@@ -512,12 +530,21 @@ print_graph_entry_leaf(struct trace_iterator *iter,
 }
 
 static enum print_line_t
-print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
-                        struct trace_seq *s, pid_t pid, int cpu)
+print_graph_entry_nested(struct trace_iterator *iter,
+                         struct ftrace_graph_ent_entry *entry,
+                         struct trace_seq *s, int cpu)
 {
-        int i;
-        int ret;
         struct ftrace_graph_ent *call = &entry->graph_ent;
+        struct fgraph_data *data = iter->private;
+        int ret;
+        int i;
+
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+                *depth = call->depth;
+        }
 
         /* No overhead */
         ret = print_graph_overhead(-1, s);
@@ -557,13 +584,13 @@ static enum print_line_t
 print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
                      int type, unsigned long addr)
 {
+        struct fgraph_data *data = iter->private;
         struct trace_entry *ent = iter->ent;
-        pid_t *last_pid = iter->private;
         int cpu = iter->cpu;
         int ret;
 
         /* Pid */
-        if (verif_pid(s, ent->pid, cpu, last_pid) == TRACE_TYPE_PARTIAL_LINE)
+        if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         if (type) {
@@ -616,7 +643,7 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
         if (leaf_ret)
                 return print_graph_entry_leaf(iter, field, leaf_ret, s);
         else
-                return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
+                return print_graph_entry_nested(iter, field, s, cpu);
 
 }
 
@@ -624,11 +651,24 @@ static enum print_line_t
 print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
                    struct trace_entry *ent, struct trace_iterator *iter)
 {
-        int i;
-        int ret;
-        int cpu = iter->cpu;
-        pid_t pid = ent->pid;
         unsigned long long duration = trace->rettime - trace->calltime;
+        struct fgraph_data *data = iter->private;
+        pid_t pid = ent->pid;
+        int cpu = iter->cpu;
+        int ret;
+        int i;
+
+        if (data) {
+                int cpu = iter->cpu;
+                int *depth = &(per_cpu_ptr(data, cpu)->depth);
+
+                /*
+                 * Comments display at + 1 to depth. This is the
+                 * return from a function, we now want the comments
+                 * to display at the same level of the bracket.
+                 */
+                *depth = trace->depth - 1;
+        }
 
         if (print_graph_prologue(iter, s, 0, 0))
                 return TRACE_TYPE_PARTIAL_LINE;
@@ -675,8 +715,13 @@ static enum print_line_t
 print_graph_comment(struct bprint_entry *trace, struct trace_seq *s,
                    struct trace_entry *ent, struct trace_iterator *iter)
 {
-        int i;
+        struct fgraph_data *data = iter->private;
+        int depth = 0;
         int ret;
+        int i;
+
+        if (data)
+                depth = per_cpu_ptr(data, iter->cpu)->depth;
 
         if (print_graph_prologue(iter, s, 0, 0))
                 return TRACE_TYPE_PARTIAL_LINE;
@@ -694,8 +739,8 @@ print_graph_comment(struct bprint_entry *trace, struct trace_seq *s,
         }
 
         /* Indentation */
-        if (trace->depth > 0)
-                for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
+        if (depth > 0)
+                for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
                         ret = trace_seq_printf(s, " ");
                         if (!ret)
                                 return TRACE_TYPE_PARTIAL_LINE;
@@ -780,19 +825,21 @@ static void print_graph_headers(struct seq_file *s)
 
 static void graph_trace_open(struct trace_iterator *iter)
 {
-        /* pid on the last trace processed */
-        pid_t *last_pid = alloc_percpu(pid_t);
+        /* pid and depth on the last trace processed */
+        struct fgraph_data *data = alloc_percpu(struct fgraph_data);
         int cpu;
 
-        if (!last_pid)
+        if (!data)
                 pr_warning("function graph tracer: not enough memory\n");
         else
                 for_each_possible_cpu(cpu) {
-                        pid_t *pid = per_cpu_ptr(last_pid, cpu);
+                        pid_t *pid = &(per_cpu_ptr(data, cpu)->last_pid);
+                        int *depth = &(per_cpu_ptr(data, cpu)->depth);
                         *pid = -1;
+                        *depth = 0;
                 }
 
-        iter->private = last_pid;
+        iter->private = data;
 }
 
 static void graph_trace_close(struct trace_iterator *iter)