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selftests/bpf: Fix clang compilation errors 

llvm upstream patch ([1]) added to issue warning for code like
  void test() {
    int j = 0;
    for (int i = 0; i < 1000; i++)
            j++;
    return;
  }

This triggered several errors in selftests/bpf build since
compilation flag -Werror is used.
  ...
  test_lpm_map.c:212:15: error: variable 'n_matches' set but not used [-Werror,-Wunused-but-set-variable]
        size_t i, j, n_matches, n_matches_after_delete, n_nodes, n_lookups;
                     ^
  test_lpm_map.c:212:26: error: variable 'n_matches_after_delete' set but not used [-Werror,-Wunused-but-set-variable]
        size_t i, j, n_matches, n_matches_after_delete, n_nodes, n_lookups;
                                ^
  ...
  prog_tests/get_stack_raw_tp.c:32:15: error: variable 'cnt' set but not used [-Werror,-Wunused-but-set-variable]
        static __u64 cnt;
                     ^
  ...

  For test_lpm_map.c, 'n_matches'/'n_matches_after_delete' are changed to be volatile
  in order to silent the warning. I didn't remove these two declarations since
  they are referenced in a commented code which might be used by people in certain
  cases. For get_stack_raw_tp.c, the variable 'cnt' is removed.

  [1] https://reviews.llvm.org/D122271

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220325200304.2915588-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2022-03-25 13:03:04 -07:00 committed by Alexei Starovoitov
parent 9e92883111
commit ccaff3d56a
2 changed files with 2 additions and 4 deletions
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3
tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c
View File

@ -29,11 +29,8 @@ static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size)
*/
struct get_stack_trace_t e;
int i, num_stack;
static __u64 cnt;
struct ksym *ks;
cnt++;
memset(&e, 0, sizeof(e));
memcpy(&e, data, size <= sizeof(e) ? size : sizeof(e));

3
tools/testing/selftests/bpf/test_lpm_map.c
View File

@ -209,7 +209,8 @@ static void test_lpm_order(void)
static void test_lpm_map(int keysize)
{
LIBBPF_OPTS(bpf_map_create_opts, opts, .map_flags = BPF_F_NO_PREALLOC);
size_t i, j, n_matches, n_matches_after_delete, n_nodes, n_lookups;
volatile size_t n_matches, n_matches_after_delete;
size_t i, j, n_nodes, n_lookups;
struct tlpm_node *t, *list = NULL;
struct bpf_lpm_trie_key *key;
uint8_t *data, *value;