linux-kernel - [PATCH 01/10] perf python: Remove dependency on 'machine' methods

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Message-Id: <1438273028-5191-2-git-send-email-acme@kernel.org>
Date:	Thu, 30 Jul 2015 13:16:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 01/10] perf python: Remove dependency on 'machine' methods

From: Arnaldo Carvalho de Melo <acme@...hat.com>

The python binding still doesn't provide symbol resolving facilities,
but the recent addition of the trace_event__register_resolver() function
made it add as a dependency the machine__resolve_kernel_addr() method,
that in turn drags all the symbol resolving code.

The problem:

  [root@zoo ~]# perf test -v python
  17: Try 'import perf' in python, checking link problems      :
  --- start ---
  test child forked, pid 6853
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  ImportError: /tmp/build/perf/python/perf.so: undefined symbol: machine__resolve_kernel_addr
  test child finished with -1
  ---- end ----
  Try 'import perf' in python, checking link problems: FAILED!
  [root@zoo ~]#

Fix it by requiring this function to receive the resolver as a
parameter, just like pevent_register_function_resolver(), i.e. do
not explicitely refer to an object file not included in
tools/perf/util/python-ext-sources.

  [root@zoo ~]# perf test python
  17: Try 'import perf' in python, checking link problems      : Ok
  [root@zoo ~]#

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Fixes: c3168b0db93a ("perf symbols: Provide libtraceevent callback to resolve kernel symbols")
Link: http://lkml.kernel.org/n/tip-vxlhh95v2em9zdbgj3jm7xi5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c    | 2 +-
 tools/perf/util/trace-event.c | 7 +++----
 tools/perf/util/trace-event.h | 3 ++-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 282841b10f24..06cfa93c0305 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1489,7 +1489,7 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 	if (trace->host == NULL)
 		return -ENOMEM;
 
-	if (trace_event__register_resolver(trace->host) < 0)
+	if (trace_event__register_resolver(trace->host, machine__resolve_kernel_addr) < 0)
 		return -errno;
 
 	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c
index 667bd109d16f..b90e646c7a91 100644
--- a/tools/perf/util/trace-event.c
+++ b/tools/perf/util/trace-event.c
@@ -50,14 +50,13 @@ static int trace_event__init2(void)
 	return 0;
 }
 
-int trace_event__register_resolver(struct machine *machine)
+int trace_event__register_resolver(struct machine *machine,
+				   pevent_func_resolver_t *func)
 {
 	if (!tevent_initialized && trace_event__init2())
 		return -1;
 
-	return pevent_set_function_resolver(tevent.pevent,
-					    machine__resolve_kernel_addr,
-					    machine);
+	return pevent_set_function_resolver(tevent.pevent, func, machine);
 }
 
 void trace_event__cleanup(struct trace_event *t)
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 568128c3284a..da6cc4cc2a4f 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -18,7 +18,8 @@ struct trace_event {
 
 int trace_event__init(struct trace_event *t);
 void trace_event__cleanup(struct trace_event *t);
-int trace_event__register_resolver(struct machine *machine);
+int trace_event__register_resolver(struct machine *machine,
+				   pevent_func_resolver_t *func);
 struct event_format*
 trace_event__tp_format(const char *sys, const char *name);
 
-- 
2.1.0

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