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| author |   Steven Rostedt <rostedt@goodmis.org> | 2013-11-11 16:08:10 -0500 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-11-12 17:23:44 -0300 |
| commit | 0497a9ebaf7ae4d573497b3e053ad4c3d5c9921d (patch) | |
| tree | 093292321d5a066d8aa7e6528e9fcf0081c4f4a7 /tools/lib | |
| parent | perf target: Shorten perf_target__ to target__ (diff) | |
| download | linux-dev-0497a9ebaf7ae4d573497b3e053ad4c3d5c9921d.tar.xz linux-dev-0497a9ebaf7ae4d573497b3e053ad4c3d5c9921d.zip | |
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/lib')
| -rw-r--r-- | tools/lib/traceevent/event-parse.c | 13 |
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; } |