Merge branch 'tip/perf/urgent-3' of git://git.kernel.org/pub/scm/linux/kernel/git...

Conflicts:
	kernel/trace/trace_events.c

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --cc kernel/trace/ring_buffer.c
Simple merge

diff --cc kernel/trace/trace.c
Simple merge

diff --cc kernel/trace/trace_events.c
index 09b4fa6,45a8968..4c758f1
--- 1/kernel/trace/trace_events.c
--- 2/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@@ -598,88 -546,155 +598,165 @@@ out
        return ret;
  }
  
- static void print_event_fields(struct trace_seq *s, struct list_head *head)
+ enum {
+       FORMAT_HEADER           = 1,
+       FORMAT_PRINTFMT         = 2,
+ };
+ 
+ static void *f_next(struct seq_file *m, void *v, loff_t *pos)
  {
+       struct ftrace_event_call *call = m->private;
        struct ftrace_event_field *field;
 -      loff_t index = *pos;
+       struct list_head *head;
  
-       list_for_each_entry_reverse(field, head, link) {
-               /*
-                * Smartly shows the array type(except dynamic array).
-                * Normal:
-                *      field:TYPE VAR
-                * If TYPE := TYPE[LEN], it is shown:
-                *      field:TYPE VAR[LEN]
-                */
-               const char *array_descriptor = strchr(field->type, '[');
+       (*pos)++;
  
-               if (!strncmp(field->type, "__data_loc", 10))
-                       array_descriptor = NULL;
 -      head = trace_get_fields(call);
 -
+       switch ((unsigned long)v) {
+       case FORMAT_HEADER:
++              head = &ftrace_common_fields;
  
-               if (!array_descriptor) {
-                       trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
-                                       "\tsize:%u;\tsigned:%d;\n",
-                                       field->type, field->name, field->offset,
-                                       field->size, !!field->is_signed);
-               } else {
-                       trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
-                                       "\tsize:%u;\tsigned:%d;\n",
-                                       (int)(array_descriptor - field->type),
-                                       field->type, field->name,
-                                       array_descriptor, field->offset,
-                                       field->size, !!field->is_signed);
-               }
+               if (unlikely(list_empty(head)))
+                       return NULL;
+ 
+               field = list_entry(head->prev, struct ftrace_event_field, link);
+               return field;
+ 
+       case FORMAT_PRINTFMT:
+               /* all done */
+               return NULL;
+       }
+ 
++      head = trace_get_fields(call);
++
+       /*
+        * To separate common fields from event fields, the
+        * LSB is set on the first event field. Clear it in case.
+        */
+       v = (void *)((unsigned long)v & ~1L);
+ 
+       field = v;
++      /*
++       * If this is a common field, and at the end of the list, then
++       * continue with main list.
++       */
++      if (field->link.prev == &ftrace_common_fields) {
++              if (unlikely(list_empty(head)))
++                      return NULL;
++              field = list_entry(head->prev, struct ftrace_event_field, link);
++              /* Set the LSB to notify f_show to print an extra newline */
++              field = (struct ftrace_event_field *)
++                      ((unsigned long)field | 1);
++              return field;
 +      }
++
++      /* If we are done tell f_show to print the format */
+       if (field->link.prev == head)
+               return (void *)FORMAT_PRINTFMT;
+ 
+       field = list_entry(field->link.prev, struct ftrace_event_field, link);
+ 
 -      /* Set the LSB to notify f_show to print an extra newline */
 -      if (index == COMMON_FIELD_COUNT)
 -              field = (struct ftrace_event_field *)
 -                      ((unsigned long)field | 1);
 -
+       return field;
  }
  
- static ssize_t
- event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
-                 loff_t *ppos)
+ static void *f_start(struct seq_file *m, loff_t *pos)
  {
-       struct ftrace_event_call *call = filp->private_data;
-       struct list_head *head;
-       struct trace_seq *s;
-       char *buf;
-       int r;
+       loff_t l = 0;
+       void *p;
  
-       if (*ppos)
+       /* Start by showing the header */
+       if (!*pos)
+               return (void *)FORMAT_HEADER;
+ 
+       p = (void *)FORMAT_HEADER;
+       do {
+               p = f_next(m, p, &l);
+       } while (p && l < *pos);
+ 
+       return p;
+ }
+ 
+ static int f_show(struct seq_file *m, void *v)
+ {
+       struct ftrace_event_call *call = m->private;
+       struct ftrace_event_field *field;
+       const char *array_descriptor;
+ 
+       switch ((unsigned long)v) {
+       case FORMAT_HEADER:
+               seq_printf(m, "name: %s\n", call->name);
+               seq_printf(m, "ID: %d\n", call->event.type);
+               seq_printf(m, "format:\n");
                return 0;
  
-       s = kmalloc(sizeof(*s), GFP_KERNEL);
-       if (!s)
-               return -ENOMEM;
+       case FORMAT_PRINTFMT:
+               seq_printf(m, "\nprint fmt: %s\n",
+                          call->print_fmt);
+               return 0;
+       }
  
-       trace_seq_init(s);
+       /*
+        * To separate common fields from event fields, the
+        * LSB is set on the first event field. Clear it and
+        * print a newline if it is set.
+        */
+       if ((unsigned long)v & 1) {
+               seq_putc(m, '\n');
+               v = (void *)((unsigned long)v & ~1L);
+       }
  
-       trace_seq_printf(s, "name: %s\n", call->name);
-       trace_seq_printf(s, "ID: %d\n", call->event.type);
-       trace_seq_printf(s, "format:\n");
+       field = v;
  
-       /* print common fields */
-       print_event_fields(s, &ftrace_common_fields);
+       /*
+        * Smartly shows the array type(except dynamic array).
+        * Normal:
+        *      field:TYPE VAR
+        * If TYPE := TYPE[LEN], it is shown:
+        *      field:TYPE VAR[LEN]
+        */
+       array_descriptor = strchr(field->type, '[');
  
-       trace_seq_putc(s, '\n');
+       if (!strncmp(field->type, "__data_loc", 10))
+               array_descriptor = NULL;
  
-       /* print event specific fields */
-       head = trace_get_fields(call);
-       print_event_fields(s, head);
+       if (!array_descriptor)
+               seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
+                          field->type, field->name, field->offset,
+                          field->size, !!field->is_signed);
+       else
+               seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
+                          (int)(array_descriptor - field->type),
+                          field->type, field->name,
+                          array_descriptor, field->offset,
+                          field->size, !!field->is_signed);
  
-       r = trace_seq_printf(s, "\nprint fmt: %s\n", call->print_fmt);
+       return 0;
+ }
  
-       if (!r) {
-               /*
-                * ug!  The format output is bigger than a PAGE!!
-                */
-               buf = "FORMAT TOO BIG\n";
-               r = simple_read_from_buffer(ubuf, cnt, ppos,
-                                             buf, strlen(buf));
-               goto out;
-       }
+ static void f_stop(struct seq_file *m, void *p)
+ {
+ }
  
-       r = simple_read_from_buffer(ubuf, cnt, ppos,
-                                   s->buffer, s->len);
-  out:
-       kfree(s);
-       return r;
+ static const struct seq_operations trace_format_seq_ops = {
+       .start          = f_start,
+       .next           = f_next,
+       .stop           = f_stop,
+       .show           = f_show,
+ };
+ 
+ static int trace_format_open(struct inode *inode, struct file *file)
+ {
+       struct ftrace_event_call *call = inode->i_private;
+       struct seq_file *m;
+       int ret;
+ 
+       ret = seq_open(file, &trace_format_seq_ops);
+       if (ret < 0)
+               return ret;
+ 
+       m = file->private_data;
+       m->private = call;
+ 
+       return 0;
  }
  
  static ssize_t

diff --cc kernel/trace/trace_functions_graph.c
Simple merge

diff --cc scripts/recordmcount.pl
Simple merge