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 <adilger.kernel@xxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: Michal Marek <michal.lkml@xxxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx> Cc: Olof Johansson <olof@xxxxxxxx> Cc: Konstantin Ryabitsev <konstantin@xxxxxxxxxxxxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Paul Lawrence <paullawrence@xxxxxxxxxx> Cc: Sandipan Das <sandipan@xxxxxxxxxxxxxxxxxx> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Cc: Philippe Ombredanne <pombredanne@xxxxxxxx> Cc: Paul Burton <paul.burton@xxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Willy Tarreau <w@xxxxxx> Cc: Martin Sebor <msebor@xxxxxxxxx> Cc: Christopher Li <sparse@xxxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: Theodore Ts'o <tytso@xxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> Cc: Joe Perches <joe@xxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Dominique Martinet <asmadeus@xxxxxxxxxxxxx> Cc: Stefan Agner <stefan@xxxxxxxx> Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: linux-doc@xxxxxxxxxxxxxxx Cc: linux-ext4@xxxxxxxxxxxxxxx Cc: linux-sparse@xxxxxxxxxxxxxxx Cc: linux-kbuild@xxxxxxxxxxxxxxx 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
