From nobody Fri Dec 19 11:15:56 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0B20C83F18 for ; Sat, 26 Aug 2023 07:15:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231721AbjHZHOe (ORCPT ); Sat, 26 Aug 2023 03:14:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230476AbjHZHOL (ORCPT ); Sat, 26 Aug 2023 03:14:11 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4ECF2137 for ; Sat, 26 Aug 2023 00:14:07 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id d9443c01a7336-1bc0d39b52cso11611495ad.2 for ; Sat, 26 Aug 2023 00:14:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1693034047; x=1693638847; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=bw2vMsREcv77KurmsfcR7swCy8AJPq+KbriFrDX4PYQ=; b=D5u2AjQcDsFKZ6gyFgKYdA9ekITPYtKILfZSMR7BD+CCW7jwDfa4AJNc3myvWKf/5h 6Vqhap2NyOYTqzndBtHoV97TuEvbpv8noHIpPRD6OEJ9n/iM/N4z6Co6mVNFwrmNcuwo WbqCmVPC42aUHOiNMQpu7109NZzp6PnpR9pdw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1693034047; x=1693638847; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=bw2vMsREcv77KurmsfcR7swCy8AJPq+KbriFrDX4PYQ=; b=aVTN+oE9cD2o4Q+Ts1b0i+AGe8O7+tZ2ZvehQnaBN02hMSMENkOVWzfRqer5N6RmF/ WWCLyJhmjCjxen5JOjROmDRMXHfMgb3EP2e4KVc+me2+Fo8WuqZnYv01Cz9ArZSs+0vj AlTYSE/TrTyl6O0Q8TsKWmLhGm8uuwYAr2xCUAd1qipEqUegc5oIN5mJIgOP587OUZ97 I0JMJYvXdZPGkt62EJ+R4rD+hk4VMnpzMIG2fw5D+xVyt5nMhHMRMcTlaJd3/TdkaHoD m4x0qOGqNE8OpGj3mjtqf8ZYHlY0m9yc3EoKOfVwFDOQ/TcD1r+3HbAfz9vuWXId5qD5 Hqvg== X-Gm-Message-State: AOJu0YyCBwaRkcVW3grGGIKnv/kl+k3V8BdlFyTfTibqxp2XuSQJpFqp hx15Li4U9z9WDnN7AvyfktffNg== X-Google-Smtp-Source: AGHT+IEPE5/mQHDL2cI1rWkGWf1H9bzL0SNhk927KOlXZzcOKt4MQ0Y+aaiCAigt2QWS9leNJjdupA== X-Received: by 2002:a17:902:e888:b0:1bd:edac:af44 with SMTP id w8-20020a170902e88800b001bdedacaf44mr21152605plg.51.1693034047207; Sat, 26 Aug 2023 00:14:07 -0700 (PDT) Received: from tigerii.tok.corp.google.com ([2401:fa00:8f:203:e5a4:5dc1:67ab:c8f5]) by smtp.gmail.com with ESMTPSA id d10-20020a170902654a00b001bc68602e54sm2986168pln.142.2023.08.26.00.14.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Aug 2023 00:14:06 -0700 (PDT) From: Sergey Senozhatsky To: Masahiro Yamada Cc: Nathan Chancellor , Nick Desaulniers , Nicolas Schier , Jonathan Corbet , Tomasz Figa , linux-kbuild@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: [PATCH] kconfig: add warn-unknown-symbols sanity check Date: Sat, 26 Aug 2023 16:13:52 +0900 Message-ID: <20230826071359.2060501-1-senozhatsky@chromium.org> X-Mailer: git-send-email 2.42.0.rc2.253.gd59a3bf2b4-goog MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Introduce KCONFIG_WARN_UNKNOWN_SYMBOLS environment variable, which makes Kconfig warn about unknown .config symbols. This is especially useful for continuous kernel uprevs when some symbols can be either removed or renamed between kernel releases (which can go unnoticed otherwise). By default KCONFIG_WARN_UNKNOWN_SYMBOLS generates warnings, which are non-terminal. There is an additional environment variable KCONFIG_WERROR that overrides this behaviour and turns warnings into errors. Signed-off-by: Sergey Senozhatsky --- Documentation/kbuild/kconfig.rst | 11 +++++++++++ scripts/kconfig/confdata.c | 23 +++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/kbuild/kconfig.rst b/Documentation/kbuild/kconfi= g.rst index 6530ecd99da3..4de1f5435b7b 100644 --- a/Documentation/kbuild/kconfig.rst +++ b/Documentation/kbuild/kconfig.rst @@ -56,6 +56,17 @@ KCONFIG_OVERWRITECONFIG If you set KCONFIG_OVERWRITECONFIG in the environment, Kconfig will not break symlinks when .config is a symlink to somewhere else. =20 +KCONFIG_WARN_UNKNOWN_SYMBOLS +---------------------------- +This environment variable makes Kconfig warn about all unrecognized +symbols in the .config file. + +KCONFIG_WERROR +-------------- +If set, Kconfig will treat `KCONFIG_WARN_UNKNOWN_SYMBOLS` warnings as +errors. + + `CONFIG_` --------- If you set `CONFIG_` in the environment, Kconfig will prefix all symbols diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c index 992575f1e976..c24f637827fe 100644 --- a/scripts/kconfig/confdata.c +++ b/scripts/kconfig/confdata.c @@ -349,7 +349,12 @@ int conf_read_simple(const char *name, int def) char *p, *p2; struct symbol *sym; int i, def_flags; + bool found_unknown =3D false; + const char *warn_unknown; + const char *werror; =20 + warn_unknown =3D getenv("KCONFIG_WARN_UNKNOWN_SYMBOLS"); + werror =3D getenv("KCONFIG_WERROR"); if (name) { in =3D zconf_fopen(name); } else { @@ -437,6 +442,13 @@ int conf_read_simple(const char *name, int def) if (def =3D=3D S_DEF_USER) { sym =3D sym_find(line + 2 + strlen(CONFIG_)); if (!sym) { + if (warn_unknown) { + conf_warning("unknown symbol: %s", + line + 2 + strlen(CONFIG_)); + found_unknown =3D true; + continue; + } + conf_set_changed(true); continue; } @@ -471,6 +483,13 @@ int conf_read_simple(const char *name, int def) =20 sym =3D sym_find(line + strlen(CONFIG_)); if (!sym) { + if (warn_unknown && def !=3D S_DEF_AUTO) { + conf_warning("unknown symbol: %s", + line + strlen(CONFIG_)); + found_unknown =3D true; + continue; + } + if (def =3D=3D S_DEF_AUTO) /* * Reading from include/config/auto.conf @@ -519,6 +538,10 @@ int conf_read_simple(const char *name, int def) } free(line); fclose(in); + + if (found_unknown && werror) + exit(1); + return 0; } =20 --=20 2.42.0.rc2.253.gd59a3bf2b4-goog