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selftests/bpf: Add selftests for stream functions under lock

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Add a selftest to ensure BPF stream functions can now be called
while holding a lock.

Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260203180424.14057-5-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Emil Tsalapatis 2026-02-03 13:04:24 -05:00 committed by Alexei Starovoitov
parent 9ddfa24e16
commit 4d99137eea
1 changed files with 32 additions and 0 deletions
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32
tools/testing/selftests/bpf/progs/stream.c
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@ -42,6 +42,10 @@ int size;
u64 fault_addr;
void *arena_ptr;
#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))
private(STREAM) struct bpf_spin_lock block;
SEC("syscall")
__success __retval(0)
int stream_exhaust(void *ctx)
@ -255,4 +259,32 @@ int stream_print_stack_invalid_id(void *ctx)
return bpf_stream_print_stack((enum bpf_stream_id)0xbadcafe);
}
SEC("syscall")
__arch_x86_64
__arch_arm64
__success __retval(0)
__stdout(_STR)
__stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}")
__stderr("Call trace:\n"
"{{([a-zA-Z_][a-zA-Z0-9_]*\\+0x[0-9a-fA-F]+/0x[0-9a-fA-F]+\n"
"|[ \t]+[^\n]+\n)*}}")
int stream_print_kfuncs_locked(void *ctx)
{
int ret;
bpf_spin_lock(&block);
ret = bpf_stream_printk(BPF_STDOUT, _STR);
if (ret)
goto out;
ret = bpf_stream_print_stack(BPF_STDERR);
out:
bpf_spin_unlock(&block);
return ret;
}
char _license[] SEC("license") = "GPL";