tracing/filters: Add __field_ext() to TRACE_EVENT

Add __field_ext(), so a field can be assigned to a specific
filter_type, which matches a corresponding filter function.

For example, a later patch will allow this:
	__field_ext(const char *, str, FILTER_PTR_STR);

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A7B9272.6050709@cn.fujitsu.com>

[
  Fixed a -1 to FILTER_OTHER
  Forward ported to latest kernel.
]

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

1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 46c1b977a2cb..97a2454760b0 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -194,7 +194,8 @@ int syscall_enter_define_fields(struct ftrace_event_call *call)
         for (i = 0; i < meta->nb_args; i++) {
                 ret = trace_define_field(call, meta->types[i],
                                          meta->args[i], offset,
-                                         sizeof(unsigned long), 0);
+                                         sizeof(unsigned long), 0,
+                                         FILTER_OTHER);
                 offset += sizeof(unsigned long);
         }
 
@@ -210,7 +211,8 @@ int syscall_exit_define_fields(struct ftrace_event_call *call)
         if (ret)
                 return ret;
 
-        ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0);
+        ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0,
+                                 FILTER_OTHER);
 
         return ret;
 }