From patchwork Fri Feb 28 19:46:48 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ihor Solodrai X-Patchwork-Id: 13996986 Received: from out-175.mta0.migadu.com (out-175.mta0.migadu.com [91.218.175.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23AB9277016 for ; Fri, 28 Feb 2025 19:47:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740772027; cv=none; b=CYOCydHffZXnCbb0IKGnVHEjfXvHxA8L8ZkM/HaFY+quQQw4IlfSBFIp2ySun9SgPbWAExJWlvrtOwfUitGOegGOLJKlzg5I0+Osg5IRJPdUz/8VKbVnXHTijIrIOoUB76TFYb0eD81GFqDhW2SCv4qyFcp5G74JKQiS5DLaUoM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740772027; c=relaxed/simple; bh=ckQNuNmGjM8ecvTnFMutrWxOhwHzxGo6fdCAJ6Ia6sc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oAg07zKYBMmjiUXWRsiOGD5Z/i9cOT/M6JzlsC3YQ+OxET8miCAZyhe78NZUujCDdTY0MM7X+lddDyrdYwvebLWl7QEMsoez8qV0s0jfE23hFTnRj32PKtWvXtErpqYW6EHfeqfVKdmbzbZlhwk7CM+BEGHQdWyWX3/6tSKticg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=vN6oGCSJ; arc=none smtp.client-ip=91.218.175.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="vN6oGCSJ" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1740772021; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=R6NtA1IcvY6lp5dUu6ImTMyn+vAgJw/OBPwKBKOPKck=; b=vN6oGCSJ2ZXCthutI5ziUuKgKerR0T0OK10QFpcgAjYuOiso0A/8keMevSECaQW4X/yaEr dtdfJCAv/w3gQJtE47blsDmjHOC3CKsZSGsa6ktA2uTRCi6DU8IbOCOPexPm3godoe1vG7 HmyV3Glz/6bWd3GmDV1hdvKs2vCSa8E= From: Ihor Solodrai To: dwarves@vger.kernel.org, bpf@vger.kernel.org Cc: acme@kernel.org, alan.maguire@oracle.com, ast@kernel.org, andrii@kernel.org, eddyz87@gmail.com, mykolal@fb.com, kernel-team@meta.com Subject: [PATCH dwarves v4 0/6] btf_encoder: emit type tags for bpf_arena pointers Date: Fri, 28 Feb 2025 11:46:48 -0800 Message-ID: <20250228194654.1022535-1-ihor.solodrai@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT This patch series implements emitting appropriate BTF type tags for argument and return types of kfuncs marked with KF_ARENA_* flags. For additional context see the description of BPF patch "bpf: define KF_ARENA_* flags for bpf_arena kfuncs" [1]. The feature depends on recent changes in libbpf [2]. [1] https://lore.kernel.org/bpf/20250206003148.2308659-1-ihor.solodrai@linux.dev/ [2] https://lore.kernel.org/bpf/20250130201239.1429648-1-ihor.solodrai@linux.dev/ v3->v4: * Add a patch (#2) replacing compile-time libbpf version checks with runtime checks for symbol availablility * Add a patch (#3) bumping libbpf submodule commit to latest master * Modify "btf_encoder: emit type tags for bpf_arena pointers" (#2->#4) to not use compile time libbpf version checks v2->v3: * Nits in patch #1 v1->v2: * Rewrite patch #1 refactoring btf_encoder__tag_kfuncs(): now the post-processing step is removed entirely, and kfuncs are tagged in btf_encoder__add_func(). * Nits and renames in patch #2 * Add patch #4 editing man pages v2: https://lore.kernel.org/dwarves/20250212201552.1431219-1-ihor.solodrai@linux.dev/ v1: https://lore.kernel.org/dwarves/20250207021442.155703-1-ihor.solodrai@linux.dev/ Ihor Solodrai (6): btf_encoder: refactor btf_encoder__tag_kfuncs() btf_encoder: use __weak declarations of version-dependent libbpf API pahole: sync with libbpf mainline btf_encoder: emit type tags for bpf_arena pointers pahole: introduce --btf_feature=attributes man-pages: describe attributes and remove reproducible_build btf_encoder.c | 328 ++++++++++++++++++++++----------------------- dwarves.h | 13 +- lib/bpf | 2 +- man-pages/pahole.1 | 7 +- pahole.c | 11 +- 5 files changed, 188 insertions(+), 173 deletions(-) Signed-off-by: Alan Maguire Acked-by: Ihor Solodrai