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samples/bpf: fix uninitialized warning with test_current_task_under_cgroup

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Currently, compiling samples/bpf with LLVM warns about the uninitialized
use of variable with test_current_task_under_cgroup.

    ./samples/bpf/test_current_task_under_cgroup_user.c:57:6:
    warning: variable 'cg2' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
	    if (setup_cgroup_environment())
		^~~~~~~~~~~~~~~~~~~~~~~~~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:106:8:
    note: uninitialized use occurs here
	    close(cg2);
		  ^~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:57:2:
    note: remove the 'if' if its condition is always false
	    if (setup_cgroup_environment())
	    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ./samples/bpf/test_current_task_under_cgroup_user.c:19:9:
    note: initialize the variable 'cg2' to silence this warning
	    int cg2, idx = 0, rc = 1;
		   ^
		    = 0
    1 warning generated.

This commit resolve this compiler warning by pre-initialize the variable
with error for safeguard.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221218061453.6287-4-danieltimlee@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Daniel T. Lee 2022-12-18 15:14:53 +09:00 committed by Martin KaFai Lau
parent 71135b77aa
commit 68be98e0f4
1 changed files with 4 additions and 2 deletions
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6
samples/bpf/test_current_task_under_cgroup_user.c
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@ -14,9 +14,9 @@
int main(int argc, char **argv)
{
pid_t remote_pid, local_pid = getpid();
int cg2 = -1, idx = 0, rc = 1;
struct bpf_link *link = NULL;
struct bpf_program *prog;
int cg2, idx = 0, rc = 1;
struct bpf_object *obj;
char filename[256];
int map_fd[2];
@ -103,7 +103,9 @@ int main(int argc, char **argv)
rc = 0;
err:
close(cg2);
if (cg2 != -1)
close(cg2);
cleanup_cgroup_environment();
cleanup: