Merge branch 'tip/tracing/ftrace-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace

1 files changed, 18 insertions, 17 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 0fe3b223f7ed..425725c1622d 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -223,10 +223,9 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 {
         unsigned long mask;
         const char *str;
+        const char *ret = p->buffer + p->len;
         int i;
 
-        trace_seq_init(p);
-
         for (i = 0;  flag_array[i].name && flags; i++) {
 
                 mask = flag_array[i].mask;
@@ -249,7 +248,7 @@ ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 
         trace_seq_putc(p, 0);
 
-        return p->buffer;
+        return ret;
 }
 EXPORT_SYMBOL(ftrace_print_flags_seq);
 
@@ -258,8 +257,7 @@ ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
                          const struct trace_print_flags *symbol_array)
 {
         int i;
-
-        trace_seq_init(p);
+        const char *ret = p->buffer + p->len;
 
         for (i = 0;  symbol_array[i].name; i++) {
 
@@ -275,7 +273,7 @@ ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
                 
         trace_seq_putc(p, 0);
 
-        return p->buffer;
+        return ret;
 }
 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 
@@ -389,17 +387,20 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 
                 if (ip == ULONG_MAX || !ret)
                         break;
-                if (i && ret)
-                        ret = trace_seq_puts(s, " <- ");
+                if (ret)
+                        ret = trace_seq_puts(s, " => ");
                 if (!ip) {
                         if (ret)
                                 ret = trace_seq_puts(s, "??");
+                        if (ret)
+                                ret = trace_seq_puts(s, "\n");
                         continue;
                 }
                 if (!ret)
                         break;
                 if (ret)
                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
+                ret = trace_seq_puts(s, "\n");
         }
 
         if (mm)
@@ -975,16 +976,16 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 
         trace_assign_type(field, iter->ent);
 
+        if (!trace_seq_puts(s, "<stack trace>\n"))
+                goto partial;
         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
-                if (!field->caller[i])
+                if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
                         break;
-                if (i) {
-                        if (!trace_seq_puts(s, " <= "))
-                                goto partial;
+                if (!trace_seq_puts(s, " => "))
+                        goto partial;
 
-                        if (!seq_print_ip_sym(s, field->caller[i], flags))
-                                goto partial;
-                }
+                if (!seq_print_ip_sym(s, field->caller[i], flags))
+                        goto partial;
                 if (!trace_seq_puts(s, "\n"))
                         goto partial;
         }
@@ -1012,10 +1013,10 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
         trace_assign_type(field, iter->ent);
 
-        if (!seq_print_userip_objs(field, s, flags))
+        if (!trace_seq_puts(s, "<user stack trace>\n"))
                 goto partial;
 
-        if (!trace_seq_putc(s, '\n'))
+        if (!seq_print_userip_objs(field, s, flags))
                 goto partial;
 
         return TRACE_TYPE_HANDLED;