linux-kernel - [PATCH v2 0/3] Resolve -Wattribute-alias warnings from SYSCALL

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Date:   Tue, 19 Jun 2018 13:14:55 -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 v2 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 v4.18-rc1.

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):
  powerpc: Remove -Wattribute-alias pragmas

 arch/powerpc/kernel/pci_32.c    |  4 ----
 arch/powerpc/kernel/pci_64.c    |  4 ----
 arch/powerpc/kernel/rtas.c      |  4 ----
 arch/powerpc/kernel/signal_32.c |  8 --------
 arch/powerpc/kernel/signal_64.c |  4 ----
 arch/powerpc/kernel/syscalls.c  |  4 ----
 arch/powerpc/mm/subpage-prot.c  |  4 ----
 include/linux/compat.h          |  8 +++++++-
 include/linux/compiler-gcc.h    | 27 +++++++++++++++++++++++++++
 include/linux/compiler_types.h  | 18 ++++++++++++++++++
 include/linux/syscalls.h        |  4 ++++
 11 files changed, 56 insertions(+), 33 deletions(-)

-- 
2.17.1