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selftests/bpf: Run the cpumask map insert tests only for the test task

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verify_success() attaches each cpumask test program to task_newtask,
forks a single child, and expects err to be 0 afterwards. Most programs
return right away for other tasks than the test one.

test_insert_leave and test_insert_remove_release don't, and insert a
cpumask into the single entry of __cpumask_map for every task created
in the system while they are attached. test_insert_leave leaves its
cpumask in the map, so a second task created, for instance by a test
running in parallel, fails to insert one and sets err to 3. Two tasks
created at the same time can do the same to test_insert_remove_release.

Return early for other tasks than the test one in both programs, as the
other programs do.

Fixes: 7b6abcfa15 ("selftests/bpf: Add selftest suite for cpumask kfuncs")
Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
Link: https://lore.kernel.org/bpf/20261009-selftests-bpf-cpumask-insert-filter-v1-1-3249218594d7@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Qiliang Yuan 2026-10-09 09:49:32 +08:00 committed by Kumar Kartikeya Dwivedi
parent 44b6b1dfb2
commit e2c978ad41
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GPG Key ID: 472D377B63542F83
1 changed files with 6 additions and 0 deletions
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6
tools/testing/selftests/bpf/progs/cpumask_success.c
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@ -460,6 +460,9 @@ int BPF_PROG(test_insert_leave, struct task_struct *task, u64 clone_flags)
{
struct bpf_cpumask *cpumask;
if (!is_test_task())
return 0;
cpumask = create_cpumask();
if (!cpumask)
return 0;
@ -476,6 +479,9 @@ int BPF_PROG(test_insert_remove_release, struct task_struct *task, u64 clone_fla
struct bpf_cpumask *cpumask;
struct __cpumask_map_value *v;
if (!is_test_task())
return 0;
cpumask = create_cpumask();
if (!cpumask)
return 0;