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[bpf-next,1/3] selftests/bpf: fix test_spin_lock_fail.c's global vars usage

Message ID 20241023043908.3834423-2-andrii@kernel.org (mailing list archive)
State Accepted
Commit 1b2bfc29695d273492c3dd8512775261f3272686
Delegated to: BPF
Headers show
Series Fix libbpf's bpf_object and BPF subskel interoperability | expand

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bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Andrii Nakryiko Oct. 23, 2024, 4:39 a.m. UTC 
Global variables of special types (like `struct bpf_spin_lock`) make
underlying ARRAY maps non-mmapable. To make this work with libbpf's
mmaping logic, application is expected to declare such special variables
as static, so libbpf doesn't even attempt to mmap() such ARRAYs.

test_spin_lock_fail.c didn't follow this rule, but given it relied on
this test to trigger failures, this went unnoticed, as we never got to
the step of mmap()'ing these ARRAY maps.

It is fragile and relies on specific sequence of libbpf steps, which are
an internal implementation details.

Fix the test by marking lockA and lockB as static.

Fixes: c48748aea4f8 ("selftests/bpf: Add failure test cases for spin lock pairing")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 tools/testing/selftests/bpf/progs/test_spin_lock_fail.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/test_spin_lock_fail.c b/tools/testing/selftests/bpf/progs/test_spin_lock_fail.c
index 43f40c4fe241..1c8b678e2e9a 100644
--- a/tools/testing/selftests/bpf/progs/test_spin_lock_fail.c
+++ b/tools/testing/selftests/bpf/progs/test_spin_lock_fail.c
@@ -28,8 +28,8 @@  struct {
 	},
 };
 
-SEC(".data.A") struct bpf_spin_lock lockA;
-SEC(".data.B") struct bpf_spin_lock lockB;
+static struct bpf_spin_lock lockA SEC(".data.A");
+static struct bpf_spin_lock lockB SEC(".data.B");
 
 SEC("?tc")
 int lock_id_kptr_preserve(void *ctx)