From accb9a7e87f096a12eb21256107b9c8e343f8019 Mon Sep 17 00:00:00 2001 From: KaFai Wan Date: Wed, 8 Oct 2025 18:26:27 +0800 Subject: selftests/bpf: Add test for unpinning htab with internal timer struct Add test to verify that unpinning hash tables containing internal timer structures does not trigger context warnings. Each subtest (timer_prealloc and timer_no_prealloc) can trigger the context warning when unpinning, but the warning cannot be triggered twice within a short time interval (a HZ), which is expected behavior. Signed-off-by: KaFai Wan Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20251008102628.808045-3-kafai.wan@linux.dev Signed-off-by: Alexei Starovoitov --- .../selftests/bpf/progs/test_pinning_htab.c | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/test_pinning_htab.c (limited to 'tools/testing/selftests/bpf/progs/test_pinning_htab.c') diff --git a/tools/testing/selftests/bpf/progs/test_pinning_htab.c b/tools/testing/selftests/bpf/progs/test_pinning_htab.c new file mode 100644 index 000000000000..ae227930c73c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_pinning_htab.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "vmlinux.h" +#include + +char _license[] SEC("license") = "GPL"; + +struct timer_val { + struct bpf_timer timer; +}; + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __type(key, __u32); + __type(value, struct timer_val); + __uint(max_entries, 1); +} timer_prealloc SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_HASH); + __type(key, __u32); + __type(value, struct timer_val); + __uint(max_entries, 1); + __uint(map_flags, BPF_F_NO_PREALLOC); +} timer_no_prealloc SEC(".maps"); -- cgit v1.2.3