perf tests: Check python path on attr and binding test

Current perf test code tries to execute python version 2 in order to
test attributes on perf_event_open syscall. However it's not default
python version anymore a system can have python v3 only or v2 with a
different name (e.g. python2). So if there's no such python interpreter
with the name 'python', the test would fail like this (yes, it's
happened on my new archlinux laptop :).

13: struct perf_event_attr setup :sh: python: command not found
FAILED!

As we can pass name of the python interpreter on make, use it for
the attr test also.

Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
[ committer note: Added the same mechanism to the python binding test ]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile

···
 
 $(OUTPUT)tests/attr.o: tests/attr.c $(OUTPUT)PERF-CFLAGS
 	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) \
-		'-DBINDIR="$(bindir_SQ)"' \
+		'-DBINDIR="$(bindir_SQ)"' -DPYTHON='"$(PYTHON_WORD)"' \
 		$<
 
 $(OUTPUT)tests/python-use.o: tests/python-use.c $(OUTPUT)PERF-CFLAGS
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DPYTHONPATH='"$(OUTPUT)/python"' $<
+	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) \
+		-DPYTHONPATH='"$(OUTPUT)/python"' \
+		-DPYTHON='"$(PYTHON_WORD)"' \
+		$<
 
 $(OUTPUT)util/config.o: util/config.c $(OUTPUT)PERF-CFLAGS
 	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DETC_PERFCONFIG='"$(ETC_PERFCONFIG_SQ)"' $<

tools/perf/tests/attr.c

···
 {
 	char cmd[3*PATH_MAX];
 
-	snprintf(cmd, 3*PATH_MAX, "python %s/attr.py -d %s/attr/ -p %s %s",
+	snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %s",
 		 d, d, perf, verbose ? "-v" : "");
 
 	return system(cmd);

tools/perf/tests/python-use.c

···
 	char *cmd;
 	int ret;
 
-	if (asprintf(&cmd, "echo \"import sys ; sys.path.append('%s'); import perf\" | python %s",
-		     PYTHONPATH, verbose ? "" : "2> /dev/null") < 0)
+	if (asprintf(&cmd, "echo \"import sys ; sys.path.append('%s'); import perf\" | %s %s",
+		     PYTHONPATH, PYTHON, verbose ? "" : "2> /dev/null") < 0)
 		return -1;
 
 	ret = system(cmd) ? -1 : 0;