From b540358e6c4d86eb450f3539aea198653e656641 Mon Sep 17 00:00:00 2001 From: Yonghong Song Date: Wed, 8 Dec 2021 21:04:03 -0800 Subject: [PATCH] selftests/bpf: Fix a compilation warning The following warning is triggered when I used clang compiler to build the selftest. /.../prog_tests/btf_dedup_split.c:368:6: warning: variable 'btf2' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (!ASSERT_OK(err, "btf_dedup")) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ /.../prog_tests/btf_dedup_split.c:424:12: note: uninitialized use occurs here btf__free(btf2); ^~~~ /.../prog_tests/btf_dedup_split.c:368:2: note: remove the 'if' if its condition is always false if (!ASSERT_OK(err, "btf_dedup")) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /.../prog_tests/btf_dedup_split.c:343:25: note: initialize the variable 'btf2' to silence this warning struct btf *btf1, *btf2; ^ = NULL Initialize local variable btf2 = NULL and the warning is gone. Fixes: 9a49afe6f5a5 ("selftests/bpf: Add btf_dedup case with duplicated structs within CU") Signed-off-by: Yonghong Song Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20211209050403.1770836-1-yhs@fb.com --- tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c index 878a864..90aac43 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c +++ b/tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c @@ -340,7 +340,7 @@ static void btf_add_dup_struct_in_cu(struct btf *btf, int start_id) static void test_split_dup_struct_in_cu() { - struct btf *btf1, *btf2; + struct btf *btf1, *btf2 = NULL; int err; /* generate the base data.. */ -- 2.7.4