Arnaldo Carvalho de Melo skrev 24.1.2013 22:07:
From: Arnaldo Carvalho de Melo <[email protected]>
The test_attr infrastructure hooks on the sys_perf_event_open call,
checking if a variable is set and if so calling a function to intercept
calls and do the checking.
But both the variable and the function aren't on objects that are
linked on the python binding, breaking it:
Atleast this one is 3.8 material as it is a regression since 3.7
[tmb@tmb linux-3.8-rc5]$ make -C tools/perf -s V=1 HAVE_CPLUS_DEMANGLE=1
prefix=%{_prefix} all
python_ext_build/tmp/util/evsel.o: In function `sys_perf_event_open':
/mnt/work/Mageia/RPM/1Work/kerenels/linux-3.8-rc5/tools/perf/util/../perf.h:183:
undefined reference to `test_attr__enabled'
/mnt/work/Mageia/RPM/1Work/kerenels/linux-3.8-rc5/tools/perf/util/../perf.h:184:
undefined reference to `test_attr__open'
collect2: ld returned 1 exit status
error: command 'gcc' failed with exit status 1
--
Thomas
# perf test -v 15
15: Try 'use perf' in python, checking link problems :
--- start ---
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: /home/acme/git/build/perf//python/perf.so: undefined symbol:
test_attr__enabled
---- end ----
Try 'use perf' in python, checking link problems: FAILED!
#
Fix it by moving the variable to one of the linked object files and
providing a stub for the function in the python.o object, that is only
linked in the python binding.
Now 'perf test' is happy again:
# perf test 15
15: Try 'use perf' in python, checking link problems : Ok
#
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/tests/attr.c | 2 --
tools/perf/util/python.c | 9 +++++++++
tools/perf/util/util.c | 2 ++
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c
index 25638a9..05b5acb 100644
--- a/tools/perf/tests/attr.c
+++ b/tools/perf/tests/attr.c
@@ -33,8 +33,6 @@
extern int verbose;
-bool test_attr__enabled;
-
static char *dir;
void test_attr__init(void)
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index a2657fd..925e0c3 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1045,3 +1045,12 @@ error:
if (PyErr_Occurred())
PyErr_SetString(PyExc_ImportError, "perf: Init failed!");
}
+
+/*
+ * Dummy, to avoid dragging all the test_attr infrastructure in the python
+ * binding.
+ */
+void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
+ int fd, int group_fd, unsigned long flags)
+{
+}
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 5906e84..252b889 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -12,6 +12,8 @@
*/
unsigned int page_size;
+bool test_attr__enabled;
+
bool perf_host = true;
bool perf_guest = false;
--
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