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authorSteven Rostedt <rostedt@goodmis.org>2013-11-12 01:08:10 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-11-13 00:23:44 +0400
commit0497a9ebaf7ae4d573497b3e053ad4c3d5c9921d (patch)
tree093292321d5a066d8aa7e6528e9fcf0081c4f4a7 /tools
parent602ad878d41ef097cc9aa2def7830d5bb27a15d8 (diff)
downloadlinux-0497a9ebaf7ae4d573497b3e053ad4c3d5c9921d.tar.xz
tools lib traceevent: Add direct access to dynamic arrays
Jiri Olsa was writing a plugin for the cfg80211_tx_mlme_mgmt trace event, and was not able to get the implemented function working. The event's print fmt looks like: "netdev:%s(%d), ftype:0x%.2x", REC->name, REC->ifindex, __le16_to_cpup((__le16 *)__get_dynamic_array(frame)) As there's no helper function for __le16_to_cpup(), Jiri was creating one with a plugin. But unfortunately, it would not work even though he set up the plugin correctly. The problem is that the function parameters do not handle the helper function "__get_dynamic_array()", and that passes in a NULL pointer. Adding PRINT_DYNAMIC_ARRAY direct support to eval_num_arg() allows the use of __get_dynamic_array() in function parameters. Reported-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/20131111160810.0ba9df7d@gandalf.local.home Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/lib/traceevent/event-parse.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 8f450adaa9c2..0362d575de7d 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -3435,6 +3435,19 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
goto out_warning_op;
}
break;
+ case PRINT_DYNAMIC_ARRAY:
+ /* Without [], we pass the address to the dynamic data */
+ offset = pevent_read_number(pevent,
+ data + arg->dynarray.field->offset,
+ arg->dynarray.field->size);
+ /*
+ * The actual length of the dynamic array is stored
+ * in the top half of the field, and the offset
+ * is in the bottom half of the 32 bit field.
+ */
+ offset &= 0xffff;
+ val = (unsigned long long)(data + offset);
+ break;
default: /* not sure what to do there */
return 0;
}