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Received: from sslproxy04.your-server.de ([78.46.152.42]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1wubRH-0001js-0d; Thu, 13 Aug 2026 21:50:07 +0200 Received: from localhost ([127.0.0.1]) by sslproxy04.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wubRG-000LUW-1K; Thu, 13 Aug 2026 21:50:05 +0200 Message-ID: <04493cfc-98a6-418b-8d8a-8f85688aca1b@iogearbox.net> Date: Thu, 13 Aug 2026 21:50:05 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v1] selftests/bpf: Fix insn count expectations in chained global subprogs test To: Jiayuan Chen , bpf@vger.kernel.org, memxor@gmail.com Cc: Andrii Nakryiko , Eduard Zingerman , Ihor Solodrai , Alexei Starovoitov , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Shuah Khan , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Mykyta Yatsenko , Taegu Ha , Amery Hung , Paul Chaignon , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev References: <20260813051635.121670-1-jiayuan.chen@linux.dev> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.4.3/28091/Thu Aug 13 08:25:54 2026) On 8/13/26 7:16 AM, Jiayuan Chen wrote: > The test asserts exact per-subprog insns_self/insns_total values and the > aggregate processed count, but these depend on compiler codegen. The > expected values match -mcpu=v3 output; under -mcpu=v4 clang emits a > sign-extending load in global_good() instead of a load plus two shifts, > so the subprog is verified in 3 insns instead of 5 and the test fails on > the cpuv4 flavor. > > Rewrite the involved subprogs as naked functions with hand-written > instruction sequences using only v1 instructions, so the verified insn > counts no longer depend on cpu version or compiler codegen. > > Fixes: c2e6c7de8830 ("bpf: Show more useful info in stack depth stats") > Signed-off-by: Jiayuan Chen $subj should have been bpf-next to route to BPF CI. Anyway, it was fixed in the tree via: 9786d424a36b ("selftests/bpf: Fix chained_global_func_calls_success() for cpu v4for-next") Thanks, Daniel