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Wed, 14 Oct 2026 14:44:15 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Wed, 14 Oct 2026 23:44:13 +0200 To: Leon Hwang Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Emil Tsalapatis , Ihor Solodrai , Quentin Monnet , Shuah Khan , Mykyta Yatsenko , Avinash Duduskar , Anton Protopopov , Amery Hung , Jordan Rife , Rong Tao , Eyal Birger , Pu Lehui , Jingguo Tan , Lin Ma , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH bpf-next v2 18/21] selftests/bpf: Add tracing_multi bpf prog rollback test Message-ID: References: <20261012154024.29423-1-leon.hwang@linux.dev> <20261012154024.29423-19-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261012154024.29423-19-leon.hwang@linux.dev> On Mon, Oct 12, 2026 at 11:40:20PM +0800, Leon Hwang wrote: > When rollbacking, the prepared trampolines should be reverted. > > In this test, the first bpf prog will be attached with the trampoline, and > the second bpf prog won't be attached because the bpf prog has been > attached by a fentry.multi prog, that causes the rollback procedure. there's rollback in bpf_trampoline_multi_prog_attach and in bpf_trampoline_multi_prog_prepare, would be great to cover both with tests jirka