From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=74.125.82.69 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793291409; b=eNNeUjogjF6gN1s/J48aaVP9VmiVY1x6jHbZQvaVmszOA/UGkWSFRAf9VTIPYyQWZvxb s+kgDSYfxilNgoS1F56vWrq2f/uYK9Bc6vpbPk3UPCypRUHIRNufE8uS6xy/3vxQezZXL kUq4muPuVdCgNL3l9HqhVHsJnWc+3tLF5g7O3h7dM0MQqxOOV/09Z6nVtNzwb58sWCbSK J9oA4b1h+VlR048ch7uAZREzjEepJ+gtrHfdh+X7IZLIgqU8lngryWmyqRAZJdcBOySov 5V+/EZcFMtJtmzcd/NeuluUQbARTCffym3lNMZcxRFNt/BZ/bc4qaolZk+FtoBaaMdA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793291409; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Received:Date:Mime-Version: X-Mailer:Message-ID:Subject:From:To:Cc:Content-Type; bh=1tQISsVXH4MuUL5EvY+YfKzRDahSJ0kOI6iHukWqnAw=; b=ZCTWKUaV36u9qbjhBZRurDo8N6EL5QITOIsye254ciy4PIiAUjYzNi2fMACAcuHPpXFf 3I9tfWg8A5myudd8/7zaMlhrF7x1PfNHIG5lEJY+wEFOFSe1qssHimz3wBLyU53h09drY gl24D0MohdOBdEET4lINl3S5ekVrzcshSTolh+BHTYLoblzwdGg58KUTa3q1Hi+0kXMev kjoW1Dd/uXhdq0cLmGnruqRvmwUk/BpWbnrQZpvf4PahHUU0MPZfwUryAr5e2yqhYf7Im qiLW37n55gymwNJh2ww6izfz3aUtrj/HOnzpe4ZT0w4kavr4dYAvRl6ImjZwxseoyUA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20260707 header.b=czCLSThh; arc=none smtp.remote-ip=74.125.82.69 Received: from mail-dl1-f69.google.com (mail-dl1-f69.google.com [74.125.82.69]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8C6B606A325 for ; Thu, 29 Oct 2026 16:30:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org A8C6B606A325 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20260707 header.b=czCLSThh Received: by mail-dl1-f69.google.com with SMTP id a92af1059eb24-1383723dfddso3833873c88.0 for ; Thu, 29 Oct 2026 09:30:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20260707; t=1793291408; x=1793896208; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:mime-version:date:from :to:cc:subject:date:message-id:reply-to:content-type; bh=1tQISsVXH4MuUL5EvY+YfKzRDahSJ0kOI6iHukWqnAw=; b=czCLSThhIDCywQeLmh/kVNL/gnPzvxIfDx3CfVfnUPYHpebo1Qsjc6ipuHZMSdpl7i GqNnoO3rfV/USNuFL6DOlEvo3x875BYiP7sb2R/yO2V30snu2oUDUncTGUbautoK7Ooy QCuqlU3QrkteclxcPGsCPWE7sSzaUNoqZI+K2QjB7IlzFeuaZbVi8wg485cCwBLE2jFv 0w3xHyCj/2p8+ht+GIvK8n+82iHIm5mEkuzAfLqoYgt3l1U35j4Y513WYXUQhOxFIblm Fv/Q+7I9+1pXMHeuotg4GbcCeP2uvDtydj6s/XVAdt0/5RNxkkx50HRs6wlBWGjsAPDQ B6aA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793291408; x=1793896208; h=content-type:cc:to:from:subject:message-id:mime-version:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=1tQISsVXH4MuUL5EvY+YfKzRDahSJ0kOI6iHukWqnAw=; b=BX2zE30wdxAiavEsUon3SfCGZe83+sImaFOkARvC7V30Qli8rUtZnjg21VYAYWKdNd 0hBqxSt3wSz/blmLlUVqH5Q5BnlqdfheXOpQjTEtTCWM+EdtLatw9Qaay0JeCsui5jUD YduZcFsg41ZA4+FaPJYzwpC0NTmP7lFErCAtVisz2MtTRcrgX+SSlVw5GH7eA/zVhtcg ewL8wK3GbHR1kBjNvKiFtmAfCS6ChHs+CG2nfQZxPAOPg/2nK/c7l5O7OUuCwtJguTh4 UB99BJqIdl4pIAhKaqfn1tCGH/3tTev7d2bMY8onJ3Z/A/m/vHe4RxmMnFNydcAii6qA tWgQ== X-Forwarded-Encrypted: i=1; AKwUvByT+JjQkNtOrBuoGbREIX5MWC16GnqE44gUw2JTczgssLhzuIb0GurRqj15SVQittiWzth6johMay349Ks=@vger.kernel.org X-Gm-Message-State: AFq9FYIea9XjkE0FWB+UOZD8gFDOxj5JYs9IxR5nrdQ0L+hc6fKI26oZ wRBj39qarsVFBs4yM17pCcizJHnQwFBEX+xiTYeC75AWkHe62OOeIrLSLA7sKwnmVy+AtfLXBcq +vhjmj0jA4g== X-Received: from dlbsv1.prod.google.com ([2002:a05:7022:3a01:b0:1a1:3ce6:560b]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:701b:4513:10b0:147:8a40:cdf3 with SMTP id a92af1059eb24-1a6ce209ce7mr7204887c88.24.1793291407265; Thu, 29 Oct 2026 09:30:07 -0700 (PDT) Date: Thu, 29 Oct 2026 09:29:55 -0700 X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 X-Mailer: git-send-email 2.56.0.317.g454f8302e1-goog Message-ID: <20261029162958.3224280-1-irogers@google.com> Subject: [RFC PATCH v1 0/3] tools: Add Rust library build infrastructure and prefer zlib-rs From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Quentin Monnet , Miguel Ojeda , Nathan Chancellor , Nicolas Schier , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: linux-perf-users@vger.kernel.org, bpf@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" The zlib-rs project (https://github.com/trifectatechfoundation/zlib-rs) provides a memory-safe, high-performance Rust implementation of the zlib compression specification along with a C ABI layer (libz-rs-sys) that is a drop-in replacement for the standard C zlib library. On many Linux distributions (such as Debian and Ubuntu), Rust crates like zlib-rs and libz-rs-sys are packaged as Cargo registry sources under /usr/share/cargo/registry/ (e.g. librust-libz-rs-sys-dev) rather than as prebuilt C shared libraries, while other environments may install prebuilt libz_rs libraries via pkg-config or a custom prefix (LIBZ_RS_DIR). This RFC series lays the groundwork for building and linking Rust crate libraries in tools/ (without requiring network access or invoking cargo) and integrates zlib-rs support into perf and bpftool, preferring zlib-rs over C zlib when available: 1. **tools build: Add Rust library build infrastructure and zlib-rs feature test**: - Adds `tools/build/Makefile.rust` with helpers to locate Cargo crate sources in distro (`/usr/share/cargo/registry`) or local Cargo registries (`CARGO_HOME` / `~/.cargo`), map `.rlib` prerequisites to explicit `--extern =` flags, and compile `.rlib` and `.a` targets directly with `rustc`. - Resolves `zlib-rs` compiler and linker flags via `LIBZ_RS_DIR`, `pkg-config` (`libz-rs-sys-cdylib`, `zlib-rs`, `z_rs`), or compiling `liblibc.rlib`, `libzlib_rs.rlib`, and `libz_rs.a` (with the `export-symbols`, `c-allocator`, `std`, and `gz` features) into `$(OUTPUT)libz_rs/`. - Adds `tools/build/feature/test-zlib-rs.c` checking `ZLIB_VER_SUBREVISION == 15` (`0xf`, which distinguishes `libz-rs-sys`'s `zlib.h` from standard C `zlib.h`) and linking against `inflateInit()`. - Extends `tools/build/Build.include`, `tools/build/Makefile.build`, `tools/scripts/Makefile.arch`, and `tools/scripts/Makefile.include` with reusable Rust build rules, cross-compilation target triples (`RUST_TARGET_FLAGS_`), and the `feature_rust_lib` macro. 2. **perf build: Prefer zlib-rs over zlib when available**: - Moves Rust detection ahead of zlib detection in `tools/perf/Makefile.config` and prefers `zlib-rs` over C `zlib` unless `NO_ZLIB_RS=1` (or `NO_ZLIB=1` / `NO_RUST=1`) is set. - Defines both `HAVE_ZLIB_SUPPORT` and `HAVE_ZLIB_RS_SUPPORT` when `zlib-rs` is used so existing zlib call sites in `perf` work unchanged while `perf version --build-options` and `perf check feature zlib-rs` report whether `zlib-rs` is active. - Shares `$(OUTPUT)libz_rs/` with the host bootstrap `bpftool` build in `tools/perf/bpf_skel.mak` and adds `NO_ZLIB` / `NO_ZLIB_RS` tests to `tools/perf/tests/make`. 3. **bpftool: Prefer zlib-rs over zlib when available**: - Adds `zlib-rs` and `zlib` to `FEATURE_TESTS` and `FEATURE_DISPLAY` in `tools/bpf/bpftool/Makefile` and configures `ZLIB_CFLAGS` and `ZLIB_LIBS` via `feature_rust_lib` when `zlib-rs` is detected. AI Assistance Disclosure (per Documentation/process/coding-assistants.rst and Documentation/process/generated-content.rst): - Tools used: Antigravity coding assistant and Sashiko automated patch review using Gemini 4 LLMs. - Summary of prompts and assistance: Interactive pair-programming session to identify distro packaging for zlib-rs/libz-rs-sys, implement the zlib-rs feature test and Makefile.rust crate build rules, integrate zlib-rs detection into perf and bpftool, separate Rust library outputs into $(OUTPUT)libz_rs/, and address automated review feedback on crate version sorting, cross-compilation flags, and libbpf EXTRA_CFLAGS handling. - Testing performed: Built and tested perf and bpftool with zlib-rs (default), NO_ZLIB_RS=1 (fallback to C zlib), NO_ZLIB=1, and MINIMAL=1; verified `perf version --build-options`, `perf check feature`, and the `make_no_zlib` / `make_no_zlib_rs` tests in `tools/perf/tests/make`; and checked all commits with `scripts/checkpatch.pl`. Assisted-by: Antigravity:gemini-4 Ian Rogers (3): tools build: Add Rust library build infrastructure and zlib-rs feature test perf build: Prefer zlib-rs over zlib when available bpftool: Prefer zlib-rs over zlib when available tools/bpf/bpftool/.gitignore | 1 + tools/bpf/bpftool/Makefile | 56 ++++++++- tools/build/Build.include | 14 ++- tools/build/Makefile.build | 13 +- tools/build/Makefile.feature | 9 +- tools/build/Makefile.rust | 149 +++++++++++++++++++++++ tools/build/feature/.gitignore | 1 + tools/build/feature/Makefile | 9 +- tools/build/feature/test-zlib-rs.c | 19 +++ tools/perf/.gitignore | 1 + tools/perf/Documentation/perf-check.txt | 1 + tools/perf/Makefile.config | 89 ++++++++------ tools/perf/Makefile.perf | 32 ++++- tools/perf/bpf_skel.mak | 8 +- tools/perf/builtin-check.c | 1 + tools/perf/scripts/install-build-deps.sh | 6 + tools/perf/tests/make | 9 ++ tools/scripts/Makefile.arch | 14 +++ tools/scripts/Makefile.include | 10 ++ 19 files changed, 385 insertions(+), 57 deletions(-) create mode 100644 tools/build/Makefile.rust create mode 100644 tools/build/feature/test-zlib-rs.c -- 2.56.0.313.g2479322e68-goog