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

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Date:   Sun, 17 Jun 2018 10:11:53 +0900
From:   Stafford Horne <shorne@...il.com>
To:     Paul Burton <paul.burton@...s.com>
Cc:     linux-kbuild@...r.kernel.org,
        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>,
        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
Subject: Re: [PATCH 0/3] Resolve -Wattribute-alias warnings from
 SYSCALL_DEFINEx()

On Fri, Jun 15, 2018 at 05:53:19PM -0700, Paul Burton wrote:
> 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(-)

Hello Paul,

I tested the series out with the new OpenRISC 9.0.0 port and the
-Wattribute-alias warnings are gone.  Thank you.

Using toolchain binaries from:
  https://github.com/stffrdhrn/gcc/releases/tag/or1k-9.0.0-20180613

For the series:

Tested-by: Stafford Horne <shorne@...il.com>

-Stafford