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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4b43c7480e3sm87089165e9.7.2026.11.04.06.23.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Nov 2026 06:23:09 -0800 (PST) Date: Wed, 4 Nov 2026 14:23:07 +0000 From: David Laight To: Samuel Wu Cc: Jonathan Corbet , Shuah Khan , Randy Dunlap , Alexander Viro , Christian Brauner , Jan Kara , Andrii Nakryiko , Eduard Zingerman , Ihor Solodrai , Alexei Starovoitov , Daniel Borkmann , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH bpf-next v2 1/6] kallsyms: Add KALLSYMS_QUERY ioctl to /proc/kallsyms Message-ID: <20261104142307.431fc12f@pumpkin> In-Reply-To: References: <20261023001603.560210-8-wusamuel@google.com> <20261023001603.560210-9-wusamuel@google.com> <20261028134012.01d52e94@pumpkin> <20261030100215.6f8e0d4f@pumpkin> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Tue, 3 Nov 2026 17:14:26 -0800 Samuel Wu wrote: > On Fri, Oct 30, 2026 at 3:02=E2=80=AFAM David Laight > wrote: > > > > On Thu, 29 Oct 2026 15:05:45 -0700 > > Samuel Wu wrote: =20 > [...] > > > BY_NAME matches names exactly, like kallsyms_lookup_name(), so they > > > would be different symbols at different addresses. Please correct me > > > if I'm missing something here! =20 > > > > Only that the user might really want one of the copies. > > Sometimes there is only the copy. =20 >=20 > Good point. I'll have v3 add KALLSYMS_F_PREFIX + pos/next_pos > pagination to cover these. A prefix query for "foo." also finds the > copies when plain foo does not exist (expanded on this in my reply to > Andrii's Oct 30 mail in this thread). I'm busy rebasing my patches - they got stamped all over :-( I should get a v3 that applies by the end of the week. I will add a 'prefix' variant for you. The 'next symbol matches' flag is exactly that (actually it is a this symbol is a duplicate to avoid issues at the start of the array). So in this case that application would always need to read the next symbol (by name). I think it might be more sensible (less pitfalls later on) to return the symbol number - not that of the next one. David