From b97dea91eb904b2950f3dffb7562a7fe558e3554 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Wed, 3 Mar 2021 01:44:20 +0100
Subject: selftests: fix prepending $(OUTPUT) to $(TEST_PROGS)

From: Ilya Leoshkevich <iii@linux.ibm.com>

[ Upstream commit cb4969e6f9f5ee12521aec764fa3d4bbd91bc797 ]

Currently the following command produces an error message:

    linux# make kselftest TARGETS=bpf O=/mnt/linux-build
    # selftests: bpf: test_libbpf.sh
    # ./test_libbpf.sh: line 23: ./test_libbpf_open: No such file or directory
    # test_libbpf: failed at file test_l4lb.o
    # selftests: test_libbpf [FAILED]

The error message might not affect the return code of make, therefore
one needs to grep make output in order to detect it.

This is not the only instance of the same underlying problem; any test
with more than one element in $(TEST_PROGS) fails the same way. Another
example:

    linux# make O=/mnt/linux-build TARGETS=splice kselftest
    [...]
    # ./short_splice_read.sh: 15: ./splice_read: not found
    # FAIL: /sys/module/test_module/sections/.init.text 2
    not ok 2 selftests: splice: short_splice_read.sh # exit=1

The current logic prepends $(OUTPUT) only to the first member of
$(TEST_PROGS). After that, run_one() does

   cd `dirname $TEST`

For all tests except the first one, `dirname $TEST` is ., which means
they cannot access the files generated in $(OUTPUT).

Fix by using $(addprefix) to prepend $(OUTPUT)/ to each member of
$(TEST_PROGS).

Fixes: 1a940687e424 ("selftests: lib.mk: copy test scripts and test files for make O=dir run")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/testing/selftests/lib.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
index a5ce26d548e4..be17462fe146 100644
--- a/tools/testing/selftests/lib.mk
+++ b/tools/testing/selftests/lib.mk
@@ -74,7 +74,8 @@ ifdef building_out_of_srctree
 		rsync -aq $(TEST_PROGS) $(TEST_PROGS_EXTENDED) $(TEST_FILES) $(OUTPUT); \
 	fi
 	@if [ "X$(TEST_PROGS)" != "X" ]; then \
-		$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) $(OUTPUT)/$(TEST_PROGS)) ; \
+		$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) \
+				  $(addprefix $(OUTPUT)/,$(TEST_PROGS))) ; \
 	else \
 		$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS)); \
 	fi
-- 
2.30.2