linux-kernel - Re: [PATCH v2 0/4] Disable compat cruft on ppc64le v2

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Message-ID: <dbc5abde-ea15-be43-1fdb-d16052c19e03@c-s.fr>
Date:   Wed, 28 Aug 2019 13:08:48 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michal Suchanek <msuchanek@...e.de>, linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Max Filippov <jcmvbkbc@...il.com>,
        Firoz Khan <firoz.khan@...aro.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Breno Leitao <leitao@...ian.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Allison Randal <allison@...utok.net>,
        Michael Neuling <mikey@...ling.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] Disable compat cruft on ppc64le v2



On 08/28/2019 10:30 AM, Michal Suchanek wrote:
> With endian switch disabled by default the ppc64le compat supports
> ppc32le only which is something next to nobody has binaries for.
> 
> Less code means less bugs so drop the compat stuff.
> 
> I am not particularly sure about the best way to resolve the llseek
> situation. I don't see anything in the syscal tables making it
> 32bit-only so I suppose it should be available on 64bit as well.
> 
> This is tested on ppc64le top of

Really ?

I get a build failure with ppc64_defconfig + LITTLE_ENDIAN :

   CC      arch/powerpc/kernel/signal.o
arch/powerpc/kernel/signal.c: In function 'do_signal':
arch/powerpc/kernel/signal.c:250:6: error: unused variable 'is32' 
[-Werror=unused-variable]
   int is32 = is_32bit_task();
       ^~~~
cc1: all warnings being treated as errors
make[3]: *** [arch/powerpc/kernel/signal.o] Error 1

Christophe

> 
> https://patchwork.ozlabs.org/cover/1153556/
> 
> Changes in v2: saner CONFIG_COMPAT ifdefs
> 
> Thanks
> 
> Michal
> 
> Michal Suchanek (4):
>    fs: always build llseek.
>    powerpc: move common register copy functions from signal_32.c to
>      signal.c
>    powerpc/64: make buildable without CONFIG_COMPAT
>    powerpc/64: Disable COMPAT if littleendian.
> 
>   arch/powerpc/Kconfig               |   2 +-
>   arch/powerpc/include/asm/syscall.h |   2 +
>   arch/powerpc/kernel/Makefile       |  15 ++-
>   arch/powerpc/kernel/entry_64.S     |   2 +
>   arch/powerpc/kernel/signal.c       | 146 ++++++++++++++++++++++++++++-
>   arch/powerpc/kernel/signal_32.c    | 140 ---------------------------
>   arch/powerpc/kernel/syscall_64.c   |   5 +-
>   arch/powerpc/kernel/vdso.c         |   4 +-
>   arch/powerpc/perf/callchain.c      |  14 ++-
>   fs/read_write.c                    |   2 -
>   10 files changed, 177 insertions(+), 155 deletions(-)
>