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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
ccaff3d56a