From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B59F27D786 for ; Wed, 29 Jul 2026 01:39:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785289146; cv=none; b=KK/MBwaVpcbi/ztOWTy/6AP4SamuAv2h/oA5xkOAWsjhekvoToGPPkCQFkNdiaCONu8+eKdark6tnah2IGKsinkP5adE14/DgIok4c+xYKmj6nJHexQRnuL9Gyz8LOLJpGZ6wdvp7/SlKQSsWz+Bt2+8pELTIF4ku0Qp4TVoHiU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785289146; c=relaxed/simple; bh=wPc3ZJ1vXqgKLmROd5nVuryKCN9Wowg3Ohdpk9V9tBU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=m2Xih0erk7EOC/Vhl5yV4QZ6wvFe3zAEX3qakhRJtgXQVn0i4ScyavUF+4lk+QuLZphjVD580FFfHhdqMF805J7Cfk/XU5JZ0NOZMzeyzeDWg5egUD405qkTz8CglXQA3+e7Ok7ieNz/DNF0eoNYUBxY92kgKOk1FBVao4Qo0qI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ev6H/Uy0; arc=none smtp.client-ip=209.85.210.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ev6H/Uy0" Received: by mail-pf1-f170.google.com with SMTP id d2e1a72fcca58-84a4d8fd6ecso500093b3a.1 for ; Tue, 28 Jul 2026 18:39:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785289144; x=1785893944; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:content-type :references:in-reply-to:date:cc:to:from:subject:message-id:from:to :cc:subject:date:message-id:reply-to:content-type; bh=wPc3ZJ1vXqgKLmROd5nVuryKCN9Wowg3Ohdpk9V9tBU=; b=ev6H/Uy0+liZgABgp7hkz9FiueeYaWtGxjHTCyaU8Ji9T+dBxMDwmHtI8jIJI4/vl8 559QB7CV436QbGytLpVjTzBhDIW0EryFY8yH3YfyRabQUh252g+RpIqKqYQ/nfdo9uBR oOjEuV/+km2uapamPxnWhq07gBKNECEnZzIavMA91/Kg4052J26mgp6Wf7XmpK/IYiT6 0O312EnL+ZIUq/C1pYI9F/JyUBP0w9AiFiC8j5754FQd3up1hzzV/lDWu5pp7vE6t8sS PrmWo4s+R3RMzjKUiszLYqjXH3DBgN8VkDLs8XVaN7Nh5MsnW+wniVCwElJwOLAiyLJL urUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785289144; x=1785893944; h=mime-version:user-agent:content-transfer-encoding:content-type :references:in-reply-to:date:cc:to:from:subject:message-id:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=wPc3ZJ1vXqgKLmROd5nVuryKCN9Wowg3Ohdpk9V9tBU=; b=ZumZdWetPjrH5tVIwYih5ngf+b5Vyt9dmdmvw3TBdMJJqU0ZWG20mTSU11HVZvUir+ cr7tH+CX0W4pZ6uMtRry4rvlyaGmAMU1ltvma5u8X4NEff7uyDe92pVboYHr2r3dJykA e9l5aROyZHEJo4AvqfIk/DHK/VnVfwPTwj3vGHWuJ4nenb7YAVc5IImOhQ9T2KALQ96h InqLLrFU+9EMkG1FH1Ml8w+Zoty8F42u+sHM3PjHL2ThYOvFUMyFE8eyJzhkRPHZ/VqC homgX5Hie/DpPOEK2c3N0YxZF7JqWaq+b/vCQSFbStWP3h7lsW9MZymTMumKvaWGwsPE P3RQ== X-Forwarded-Encrypted: i=1; AHgh+RoJpJ8OpaW/egS49jJNpzs1ssJhdfFvqHA9xIzY3kANwt1wummiOMfEGJlHZF/4a7cp+r0=@vger.kernel.org X-Gm-Message-State: AOJu0YzCy3eYOw7/u9IDrP9kE714PHD/MoOGicF0m7DtZ7WEwOQUYCxD LvR9R7hZeG4nJdxA4Rq0HiSLU9+sYfks+CX8FlMotsDX19E9UzOQpekd X-Gm-Gg: AR+sD13+HYRhShO7bWc1eVYGjD6O2RUCJeynQpy0Dm5xkxKWACXFjiNq78RyrgFJfg2 e+4U1HiB64EFUlpBG7cDtXA4WcjxpmNBwCumJ1dN5r6sUs+fdvYRRRKuM1XKOXSTzgX8re26dO3 ix+wZ4MIq814XBnA3z1yCPRIFV6MZQ350su95mB/8NtHm76c9mN23JXuSxMS5MBYxnwPOXtAhQK zJBCQVHZ5idxdnUHAs/e0PzX3Xyp7akIX1cHxP5sVwNGkBuelWjfrIPUyeQ35URMvwaOsv0nZOU o/KYCDWsjBoxNovuk3IdOg2qbjL8//0Z1R4+MWWdmGQF1Zk21k3zyTFAtLUF0L3dKCvRVzewyqI izdI4qb9JKdTkTnYyPmsGzb1qPdiQwA8YIsyTu3OPv31jLGImspu0hPIzfBRoiexgIuDBq0fI0M hqsUbQaY+Y0IvAbmnGfFRGJeRo1TO8cyTncoKDzhkOdt6s/DwtX8c5X8T8PthW6Yly+yfs0TRG6 PNxWfphaPPMLB2D56ORZA7XmQA5A0xYtSkh8Xdwx3JsNm5mVRT3iHRKGoDMiiQ= X-Received: by 2002:a05:6a00:1396:b0:847:8b1d:230d with SMTP id d2e1a72fcca58-84e93198bf1mr4947632b3a.3.1785289144366; Tue, 28 Jul 2026 18:39:04 -0700 (PDT) Received: from ?IPv6:2605:8d80:58a5:c474:f5cf:239:70ad:a743? ([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: bpf@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 ...