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([140.174.219.137]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5033745d7a9sm111971941cf.5.2026.02.02.11.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Feb 2026 11:33:18 -0800 (PST) From: Emil Tsalapatis To: bpf@vger.kernel.org Cc: andrii@kernel.org, ast@kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, martin.lau@kernel.org, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, Emil Tsalapatis Subject: [PATCH 4/4] selftests/bpf: Add selftests for stream functions under lock Date: Mon, 2 Feb 2026 14:33:11 -0500 Message-ID: <20260202193311.446717-5-emil@etsalapatis.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20260202193311.446717-1-emil@etsalapatis.com> References: <20260202193311.446717-1-emil@etsalapatis.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a selftest to ensure BPF stream functions can now be called while holding a lock. Signed-off-by: Emil Tsalapatis (Meta) --- tools/testing/selftests/bpf/progs/stream.c | 32 ++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/selftests/bpf/progs/stream.c index f63b378de090..6f999ba951a3 100644 --- a/tools/testing/selftests/bpf/progs/stream.c +++ b/tools/testing/selftests/bpf/progs/stream.c @@ -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"; -- 2.49.0