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

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Message-ID: <CAK8P3a2Yz-02On2K2U0+8+tR8RQCQ+KWh7CrtqL9L+FweP+TPQ@mail.gmail.com>
Date:   Mon, 18 Jun 2018 15:05:57 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Paul Burton <paul.burton@...s.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        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 Mailing List <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 0/3] Resolve -Wattribute-alias warnings from SYSCALL_DEFINEx()

On Sat, Jun 16, 2018 at 2:53 AM, Paul Burton <paul.burton@...s.com> 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").
>

Sorry I dropped the ball on this earlier, and thanks a lot for picking
it up again! From what I can tell, your version addresses all issues
I was aware of, so we should merge that.

      Arnd