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selftests/bpf: Fix a compilation warning

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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: 9a49afe6f5 ("selftests/bpf: Add btf_dedup case with duplicated structs within CU")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211209050403.1770836-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-12-08 21:04:03 -08:00 committed by Andrii Nakryiko
parent 8d0f9e73ef
commit b540358e6c
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/prog_tests/btf_dedup_split.c
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@ -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.. */