linux-kernel - [PATCH 0/3] Resolve -Wattribute-alias warnings from SYSCALL

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Date:   Fri, 15 Jun 2018 17:53:19 -0700
From:   Paul Burton <paul.burton@...s.com>
To:     <linux-kbuild@...r.kernel.org>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        <linux-mips@...ux-mips.org>, Arnd Bergmann <arnd@...db.de>,
        Ingo Molnar <mingo@...nel.org>,
        Matthew Wilcox <matthew@....cx>,
        Thomas Gleixner <tglx@...utronix.de>,
        Douglas Anderson <dianders@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        He Zhe <zhe.he@...driver.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Khem Raj <raj.khem@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Al Viro <viro@...iv.linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Gideon Israel Dsouza <gidisrael@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        <linux-kernel@...r.kernel.org>, Paul Mackerras <paulus@...ba.org>,
        <linuxppc-dev@...ts.ozlabs.org>, Paul Burton <paul.burton@...s.com>
Subject: [PATCH 0/3] Resolve -Wattribute-alias warnings from SYSCALL_DEFINEx()

This series introduces infrastructure allowing compiler diagnostics to
be disabled or their severity modified for specific pieces of code, with
suitable abstractions to prevent that code from becoming tied to a
specific compiler.

This infrastructure is then used to disable the -Wattribute-alias
warning around syscall definitions, which rely on type mismatches to
sanitize arguments.

Finally PowerPC-specific #pragma's are removed now that the generic code
is handling this.

The series takes Arnd's RFC patches & addresses the review comments they
received. The most notable effect of this series to to avoid warnings &
build failures caused by -Wattribute-alias when compiling the kernel
with GCC 8.

Applies cleanly atop master as of 9215310cf13b ("Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net").

Thanks,
    Paul

Arnd Bergmann (2):
  kbuild: add macro for controlling warnings to linux/compiler.h
  disable -Wattribute-alias warning for SYSCALL_DEFINEx()

Paul Burton (1):
  Revert "powerpc: fix build failure by disabling attribute-alias
    warning in pci_32"

 arch/powerpc/kernel/pci_32.c   |  4 ---
 include/linux/compat.h         |  8 ++++-
 include/linux/compiler-gcc.h   | 66 ++++++++++++++++++++++++++++++++++
 include/linux/compiler_types.h | 18 ++++++++++
 include/linux/syscalls.h       |  4 +++
 5 files changed, 95 insertions(+), 5 deletions(-)

-- 
2.17.1