The stack tracer use to look like this:
 # cat /debug/tracing/stack_trace
         Depth  Size      Location    (57 entries)
         -----  ----      --------
  0)     5088      16   mempool_alloc_slab+0x16/0x18
  1)     5072     144   mempool_alloc+0x4d/0xfe
  2)     4928      16   scsi_sg_alloc+0x48/0x4a [scsi_mod]
Now it looks like this:
 # cat /debug/tracing/stack_trace
        Depth    Size      Location    (57 entries)
        -----    ----      --------
  0)     5088      16   mempool_alloc_slab+0x16/0x18
  1)     5072     144   mempool_alloc+0x4d/0xfe
  2)     4928      16   scsi_sg_alloc+0x48/0x4a [scsi_mod]
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
        int size;
 
        if (v == SEQ_START_TOKEN) {
-               seq_printf(m, "        Depth   Size      Location"
+               seq_printf(m, "        Depth    Size      Location"
                           "    (%d entries)\n"
-                          "        -----   ----      --------\n",
+                          "        -----    ----      --------\n",
                           max_stack_trace.nr_entries);
                return 0;
        }