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[62.83.35.8]) by smtp.gmail.com with ESMTPSA id q200-v6sm3466562wmd.2.2018.09.20.10.23.21 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Sep 2018 10:23:23 -0700 (PDT) From: Miguel Ojeda To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, Miguel Ojeda , 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 , Linus Torvalds , linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org, linux-sparse@vger.kernel.org, linux-kbuild@vger.kernel.org Subject: [PATCH v5 00/15] Compiler Attributes Date: Thu, 20 Sep 2018 19:22:46 +0200 Message-Id: <20180920172301.21868-1-miguel.ojeda.sandonis@gmail.com> Sender: linux-sparse-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sparse@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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