tracing: Make synth_event trace functions endian-correct

synth_event_trace(), synth_event_trace_array() and
__synth_event_add_val() write directly into the trace buffer and need
to take endianness into account, like trace_event_raw_event_synth()
does.

Link: http://lkml.kernel.org/r/2011354355e405af9c9d28abba430d1f5ff7771a.1581720155.git.zanussi@kernel.org
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 65b54d6..6a380fb 100644 (file)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1891,7 +1891,25 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...)
                        strscpy(str_field, str_val, STR_VAR_LEN_MAX);
                        n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
                } else {
-                       state.entry->fields[n_u64] = val;
+                       struct synth_field *field = state.event->fields[i];
+
+                       switch (field->size) {
+                       case 1:
+                               *(u8 *)&state.entry->fields[n_u64] = (u8)val;
+                               break;
+
+                       case 2:
+                               *(u16 *)&state.entry->fields[n_u64] = (u16)val;
+                               break;
+
+                       case 4:
+                               *(u32 *)&state.entry->fields[n_u64] = (u32)val;
+                               break;
+
+                       default:
+                               state.entry->fields[n_u64] = val;
+                               break;
+                       }
                        n_u64++;
                }
        }
@@ -1943,7 +1961,26 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
                        strscpy(str_field, str_val, STR_VAR_LEN_MAX);
                        n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
                } else {
-                       state.entry->fields[n_u64] = vals[i];
+                       struct synth_field *field = state.event->fields[i];
+                       u64 val = vals[i];
+
+                       switch (field->size) {
+                       case 1:
+                               *(u8 *)&state.entry->fields[n_u64] = (u8)val;
+                               break;
+
+                       case 2:
+                               *(u16 *)&state.entry->fields[n_u64] = (u16)val;
+                               break;
+
+                       case 4:
+                               *(u32 *)&state.entry->fields[n_u64] = (u32)val;
+                               break;
+
+                       default:
+                               state.entry->fields[n_u64] = val;
+                               break;
+                       }
                        n_u64++;
                }
        }
@@ -2062,8 +2099,25 @@ static int __synth_event_add_val(const char *field_name, u64 val,
 
                str_field = (char *)&entry->fields[field->offset];
                strscpy(str_field, str_val, STR_VAR_LEN_MAX);
-       } else
-               entry->fields[field->offset] = val;
+       } else {
+               switch (field->size) {
+               case 1:
+                       *(u8 *)&trace_state->entry->fields[field->offset] = (u8)val;
+                       break;
+
+               case 2:
+                       *(u16 *)&trace_state->entry->fields[field->offset] = (u16)val;
+                       break;
+
+               case 4:
+                       *(u32 *)&trace_state->entry->fields[field->offset] = (u32)val;
+                       break;
+
+               default:
+                       trace_state->entry->fields[field->offset] = val;
+                       break;
+               }
+       }
  out:
        return ret;
 }