poky/meta/recipes-kernel/lttng/lttng-tools/0002-Fix-test-skip-test_getcpu_override-on-single-thread-.patch

From e7db27668a9d7fd279d45bc43f3a2d5847374e7b Mon Sep 17 00:00:00 2001
From: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Date: Tue, 12 Mar 2019 12:04:58 -0400
Subject: [PATCH lttng-tools 1/2] Fix: test: skip test_getcpu_override on
 single thread system

There is no value in performing this test on single thread system
since the only valid value for the cpu field is 0.

This test currently fails on single thread system (i.e yocto runquemu)
on the test_getcpu_override_fail test case.

Upstream-Status: Accepted [f87d0ca370c17b597762f5ee218f0e821ed2452d]
Backported to 2.11 and 2.10

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
---
 .../ust/getcpu-override/test_getcpu_override     | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/tests/regression/ust/getcpu-override/test_getcpu_override b/tests/regression/ust/getcpu-override/test_getcpu_override
index 4ca385aeb..ee3e31953 100755
--- a/tests/regression/ust/getcpu-override/test_getcpu_override
+++ b/tests/regression/ust/getcpu-override/test_getcpu_override
@@ -157,13 +157,19 @@ plan_tests $NUM_TESTS
 
 print_test_banner "$TEST_DESC"
 
-if [ -x "$CURDIR/.libs/lttng-ust-getcpu-override-test.so" ]; then
-	foundobj=1
-else
-	foundobj=0
+if [ ! -x "$CURDIR/.libs/lttng-ust-getcpu-override-test.so" ]; then
+	skip 0 "No shared object generated. Skipping all tests." $NUM_TESTS && exit 0
+fi
+
+if [ "$num_cpus" -eq "1" ]; then
+	# Skip the test since we cannot perform it as designed since N mod 1
+	# is always equals to zero. There is no point testing this on a system
+	# with a single thread. LTTng-UST limits the get_cpu function to return
+	# value inside the [0, NUM_CPU - 1] range for a valid event (present in
+	# trace).
+	skip 0 "Test system only have a single thread. Skipping all tests." $NUM_TESTS && exit 0
 fi
 
-skip $foundobj "No shared object generated. Skipping all tests." $NUM_TESTS && exit 0
 
 TESTS=(
 	test_getcpu_override_fail
-- 
2.17.1