From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id 69D167D57F for ; Mon, 24 Sep 2018 08:46:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728007AbeIXOrr (ORCPT ); Mon, 24 Sep 2018 10:47:47 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:32801 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727525AbeIXOrr (ORCPT ); Mon, 24 Sep 2018 10:47:47 -0400 Received: by mail-wm1-f66.google.com with SMTP id r1-v6so9282405wmh.0; Mon, 24 Sep 2018 01:46:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:from:date:message-id:subject:to:cc; bh=KUHx4A3nvQqJWXd3hp1oyzoSUZ+e9ytG8rTde0hBKFg=; b=m8hfsU7vfjN/TxDXtdqjhYnR9rV0jNpiiyHbrePwHsBB4mmOjqMxCl55JTL5quWdwT 1L3PX7VX78FFL9f5FEcalpN9OfYaZpwiH/F0bHwE3sdtKc/KWDA5y2tU/l2zcn1YybkW Rl2nkL1gURxzlqs+vCGmOV3qqGlH00oyhJ2YY8Zl/fEE/PH4GULvBYRbu8KJ2h7HZoqA daIT/yCsPqcn0SzZBPpzNoA+AnITwKN9t9bz/t0zvYtKp68mlW25/QhX69tZr6THgXVC k9KMm5kKi7TzQCklR/P7GVUh1ZsoL63JyewpQUZbXZ8jYnjz/Z0QtLuXjjkJ3PRqeDxY QG6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to:cc; bh=KUHx4A3nvQqJWXd3hp1oyzoSUZ+e9ytG8rTde0hBKFg=; b=NMHBJzxDeWmayrDMqYpZmpd8/ND48FaxU1pa35pj5JB2GFoXH0uUPbiN6m7YCRDo7K CZTXsQYZ+QFqnkE5NmGoWKxmU1dHlz1Hw6oGNNbc+4cvDQD7pJl4kAJZ98qu93QIxhCz yzHOIHPSQa0y9pXBcTK0GlWQshnDJ1P8zmPhEJx22g+FYyo6WamJmDtSlcbV/SgB+L5T uBHfIGXZSK6QSliHoND+Zi7dEQzwvgiL2AcRnQYbno2vsSVH6jQzAJWFa39quawp0EQn DmdH15XDFU5k3V4303hGuP3vYd4xk5NEbszhcQ/ftLaJse3A3k8ySB+9aIPkRwNeOw3t yXiw== X-Gm-Message-State: APzg51Dh3/NLIHZZQwkITdJPTSY6rNnpdNBaY+kUZ2Ufz/p4hqz3S8nS zavKdloixdYykSUKTqJdi+myGvSPtWnG85UiGNM= X-Google-Smtp-Source: ANB0VdYBPHOe5sCUe8iBazFPTjUpXAUSpCW/rfRKeGbkRWLnK314ldql9B9rbzk/GUlignepR3x9FVsAChYcL2dtZTs= X-Received: by 2002:a1c:1eca:: with SMTP id e193-v6mr5819111wme.99.1537778805041; Mon, 24 Sep 2018 01:46:45 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:adf:94c2:0:0:0:0:0 with HTTP; Mon, 24 Sep 2018 01:46:44 -0700 (PDT) Reply-To: sedat.dilek@gmail.com From: Sedat Dilek Date: Mon, 24 Sep 2018 10:46:44 +0200 Message-ID: Subject: [PATCH v5 00/15] Compiler Attributes To: Miguel Ojeda Cc: Andreas Dilger , Masahiro Yamada , Michal Marek , Steven Rostedt , Mauro Carvalho Chehab , Olof Johansson , Konstantin Ryabitsev , "David S. Miller" , Andrey Ryabinin , Kees Cook , Thomas Gleixner , Ingo Molnar , Paul Lawrence , Sandipan Das , Andrey Konovalov , David Woodhouse , Will Deacon , Philippe Ombredanne , Paul Burton , David Rientjes , Willy Tarreau , Martin Sebor , Christopher Li , Jonathan Corbet , "Theodore Ts'o" , Geert Uytterhoeven , Rasmus Villemoes , Joe Perches , Arnd Bergmann , Dominique Martinet , Stefan Agner , Luc Van Oostenryck , Nick Desaulniers , Andrew Morton , Greg Kroah-Hartman , Linus Torvalds , linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org, linux-sparse@vger.kernel.org, linux-kbuild@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org [ Please CC me I am not subcribed to this ML ] Quote from : The Compiler Attributes series is an effort to disentangle the include/linux/compiler*.h headers and bring them up to date. The main idea behind the series is to use feature checking macros (i.e. __has_attribute) instead of compiler version checks (e.g. GCC_VERSION), which are compiler-agnostic (so they can be shared, reducing the size of compiler-specific headers) and version-agnostic. Other related improvements have been performed in the headers as well, which on top of the use of __has_attribute it has amounted to a significant simplification of these headers (e.g. GCC_VERSION is now only guarding 4 non-attribute macros). This series should also help the efforts to support compiling the kernel with clang and icc. A fair amount of documentation and comments have also been added, clarified or removed; and the headers are now more readable, which should help kernel developers in general. The series was triggered due to the move to gcc >= 4.6. In turn, this series has also triggered Sparse to gain the ability to recognize __has_attribute on its own. Finally, the nonstring variable attribute series has been applied on top of this one. You can also fetch it from: https://github.com/ojeda/linux/tree/compiler-attributes-v5 Enjoy! Cheers, Miguel Cc: Andreas Dilger Cc: Masahiro Yamada Cc: Michal Marek Cc: Steven Rostedt Cc: Mauro Carvalho Chehab Cc: Olof Johansson Cc: Konstantin Ryabitsev Cc: David S. Miller Cc: Andrey Ryabinin Cc: Kees Cook Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Paul Lawrence Cc: Sandipan Das Cc: Andrey Konovalov Cc: David Woodhouse Cc: Will Deacon Cc: Philippe Ombredanne Cc: Paul Burton Cc: David Rientjes Cc: Willy Tarreau Cc: Martin Sebor Cc: Christopher Li Cc: Jonathan Corbet Cc: Theodore Ts'o Cc: Geert Uytterhoeven Cc: Rasmus Villemoes Cc: Joe Perches Cc: Arnd Bergmann Cc: Dominique Martinet Cc: Stefan Agner Cc: Luc Van Oostenryck Cc: Nick Desaulniers Cc: Andrew Morton Cc: Greg Kroah-Hartman Cc: Linus Torvalds Cc: linux-doc@vger.kernel.org Cc: linux-ext4@vger.kernel.org Cc: linux-sparse@vger.kernel.org Cc: linux-kbuild@vger.kernel.org v4 -> v5 * Removed the 2 __naked patches, since Greg just applied them to master; and rebased on top of that. The only change in the range-diff is in "Compiler Attributes: always use the extra-underscores syntax" due to the move of __naked to compiler_types.h. * Applied the nonstring series on top of this one (last 4 patches). Rationale: - the nonstring series would anyway be modified again by this one (so it has been rebased after the general cleanup). - ext4's "local" nonstring was merged - easier to manage (and easier to see the end result) The first 2 patches of the last 4 add the warning back at W=1 and add the __nonstring attribute. The other two serve as an example of usage and as a cleanup. * Cc lists removed from each commit; using a single list in the cover letter; and a new, revised list of Cc (wider audience). Miguel Ojeda (15): Compiler Attributes: remove unused attributes Compiler Attributes: always use the extra-underscores syntax Compiler Attributes: remove unneeded tests Compiler Attributes: homogenize __must_be_array Compiler Attributes: remove unneeded sparse (__CHECKER__) tests Compiler Attributes: add missing SPDX ID in compiler_types.h Compiler Attributes: use feature checks instead of version checks Compiler Attributes: KENTRY used twice the "used" attribute Compiler Attributes: remove uses of __attribute__ from compiler.h Compiler Attributes: add Doc/process/programming-language.rst Compiler Attributes: add MAINTAINERS entry Compiler Attributes: add support for __nonstring (gcc >= 8) Compiler Attributes: enable -Wstringop-truncation on W=1 (gcc >= 8) Compiler Attributes: auxdisplay: panel: use __nonstring Compiler Attributes: ext4: remove local __nonstring definition Documentation/process/index.rst | 1 + .../process/programming-language.rst | 45 +++ MAINTAINERS | 5 + drivers/auxdisplay/panel.c | 7 +- fs/ext4/ext4.h | 9 - include/linux/compiler-clang.h | 5 - include/linux/compiler-gcc.h | 70 +---- include/linux/compiler-intel.h | 9 - include/linux/compiler.h | 19 +- include/linux/compiler_attributes.h | 258 ++++++++++++++++++ include/linux/compiler_types.h | 101 +------ scripts/Makefile.extrawarn | 1 + 12 files changed, 341 insertions(+), 189 deletions(-) create mode 100644 Documentation/process/programming-language.rst create mode 100644 include/linux/compiler_attributes.h -- 2.17.1 Tested-by: Sedat Dilek (against Linux v4.19-rc5 and built with LLVM/Clang v7)