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([2605:8d80:58a5:c474:f5cf:239:70ad:a743]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84ea0051591sm615408b3a.19.2026.07.28.18.39.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jul 2026 18:39:04 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v1 7/8] resolve_btfids: Discover kfuncs from BTF ID sets From: Eduard Zingerman To: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Kumar Kartikeya Dwivedi Cc: Benjamin Tissoires , Jiri Kosina , Emil Tsalapatis , Jiri Olsa , bpf@vger.kernel.org, linux-input@vger.kernel.org, kernel-team@meta.com Date: Tue, 28 Jul 2026 18:39:02 -0700 In-Reply-To: <20260722233518.778854-8-ihor.solodrai@linux.dev> References: <20260722233518.778854-1-ihor.solodrai@linux.dev> <20260722233518.778854-8-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-07-22 at 16:35 -0700, Ihor Solodrai wrote: > collect_kfuncs() currently uses bpf_kfunc decl tags to identify the > list of kfuncs. The decl tags are generated by pahole, which makes > current implementation implicitly rely on those tags being generated. >=20 > The authoritative source, used by the the BPF verifier for kfunc > registration, of functions being BPF kfuncs are > BTF_KFUNCS_START()/END() declarations. These are BTF_ID_SET8 under the > hood. Currently resolve_btfids reads kfunc flags from these sets, and > populates them with BTF IDs. >=20 > Implement kfunc discovery from BTF_ID_SET8 symbols in resolve_btfids, > removing the dependency on pahole's emmission of decl tags. >=20 > Walk BTF_ID_KIND_SET8 sets, and use the address-to-symbol index to > look up set entry's BTF_ID symbol name (before .BTF_ids is patched), > recording the paired flags directly. This makes find_kfunc_flags() > helper unnecessary, so it's removed. >=20 > Signed-off-by: Ihor Solodrai > --- Reviewed-by: Eduard Zingerman ...