linux-kernel - Re: [PATCH v3 02/10] include: Move compat_timespec/ timeval to compat

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Date:   Tue, 6 Mar 2018 13:48:22 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Deepa Dinamani <deepa.kernel@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:RALINK MIPS ARCHITECTURE" <linux-mips@...ux-mips.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        sparclinux <sparclinux@...r.kernel.org>,
        devel@...verdev.osuosl.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Helge Deller <deller@....de>,
        the arch/x86 maintainers <x86@...nel.org>,
        sebott@...ux.vnet.ibm.com,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...hat.com>, oprofile-list@...ts.sf.net,
        Catalin Marinas <catalin.marinas@....com>,
        Robert Richter <rric@...nel.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Julian Wiedmann <jwi@...ux.vnet.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ursula Braun <ubraun@...ux.vnet.ibm.com>,
        gerald.schaefer@...ibm.com,
        Parisc List <linux-parisc@...r.kernel.org>,
        gregkh <gregkh@...uxfoundation.org>, cohuck@...hat.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Jan Hoeppner <hoeppner@...ux.vnet.ibm.com>,
        Stefan Haberland <sth@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 02/10] include: Move compat_timespec/ timeval to
 compat_time.h



On 03/06/2018 01:46 PM, Arnd Bergmann wrote:
> On Mon, Mar 5, 2018 at 10:30 AM, Christian Borntraeger
> <borntraeger@...ibm.com> wrote:
>> On 01/16/2018 03:18 AM, Deepa Dinamani wrote:
>>> All the current architecture specific defines for these
>>> are the same. Refactor these common defines to a common
>>> header file.
>>>
>>> The new common linux/compat_time.h is also useful as it
>>> will eventually be used to hold all the defines that
>>> are needed for compat time types that support non y2038
>>> safe types. New architectures need not have to define these
>>> new types as they will only use new y2038 safe syscalls.
>>> This file can be deleted after y2038 when we stop supporting
>>> non y2038 safe syscalls.
>>
>> You are now include a <linux/*.h> from several asm files
>> (
>>  arch/arm64/include/asm/stat.h
>>  arch/s390/include/asm/elf.h
>>  arch/x86/include/asm/ftrace.h
>>  arch/x86/include/asm/sys_ia32.h
>> )
>> It works, and it is done in many places, but it looks somewhat weird.
>> Would it make sense to have an asm-generic/compate-time.h instead? Asking for
>> opinions here.
> 
> I don't think we have such a rule. If a header file is common to all
> architectures (i.e. no architecture uses a different implementation),
> it should be in include/linux rather than include/asm-generic, regardless
> of whether it can be used by assembler files or not.
> 
>>> --- a/drivers/s390/net/qeth_core_main.c
>>> +++ b/drivers/s390/net/qeth_core_main.c
>>> @@ -32,7 +32,7 @@
>>>  #include <asm/chpid.h>
>>>  #include <asm/io.h>
>>>  #include <asm/sysinfo.h>
>>> -#include <asm/compat.h>
>>> +#include <linux/compat.h>
>>>  #include <asm/diag.h>
>>>  #include <asm/cio.h>
>>>  #include <asm/ccwdev.h>
>>
>> Can you move that into the other includes (where all the other <linux/*> includes are.
> 
> Good catch, this is definitely a rule we have ;-)

FWIW, this was also broken for 
arch/x86/include/asm/sys_ia32.h