linux-kernel - Re: [PATCH 02/39] MIPS: loongson64: Add header files path prefix

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Date:   Tue, 31 Mar 2020 12:21:10 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     maobibo <maobibo@...ngson.cn>
CC:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        linux-mips <linux-mips@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/39] MIPS: loongson64: Add header files path prefix



于 2020年3月31日 GMT+08:00 上午11:53:41, maobibo <maobibo@...ngson.cn> 写到:
>
>
>On 03/31/2020 11:34 AM, Jiaxun Yang wrote:
>> 
>> 
>> --
>> Jiaxun Yang
>> 
>>  ---- 在 星期一, 2020-03-30 18:00:19 maobibo <maobibo@...ngson.cn> 撰写
>----
>>  > 
>>  > 
>>  > On 03/30/2020 04:55 PM, Jiaxun Yang wrote:
>>  > > 
>>  > > 
>>  > > 于 2020年3月30日 GMT+08:00 下午4:38:51, bibo mao <maobibo@...ngson.cn>
>写到:
>>  > >> Remove header files from arch/mips/include/asm/mach-loongson64
>>  > >> to arch/mips/loongson64/include/mach
>>  > >>
>>  > >> Signed-off-by: bibo mao <maobibo@...ngson.cn>
>>  > > 
>>  > > Hi Bibo,
>>  > > 
>>  > > Thanks for your patch.
>>  > > 
>>  > > What's your intention?
>>  > > Did you meet any problem about headers?
>>  > > 
>>  > 
>>  > Hi Jiaxun,
>>  > 
>>  > When I add irqchip support for mips kvm, file virt/kvm/irqchip.c
>>  > requires local header file arch/mips/kvm/irq.h, it fails to
>compile.
>>  > Since there is file with the same name located at:
>>  >   arch/mips/include/asm/mach-generic/irq.h
>>  >   arch/mips/include/asm/mach-loongson64/irq.h
>>  > 
>>  > The compiler fails to choose the correct header file irq.h,
>> 
>> You'd better rename kvm's irq.h in this case.
>why should we rename kvm's irq.h?  It works on other arches like
>x86/aarch/powerpc, it does not work on mips platform. Just because
>these
>header files are not used with path prefix on mips system, it brings
>out
>such problem.
>
>Today if we modify generic kvm code, it maybe brings out problem with
>other modules tommorrow. Else we declare that these files can be
>defined
>locally on all modules:
>  cpu-feature-overrides.h  floppy.h  ide.h  ioremap.h  irq.h
>  kernel-entry-init.h  kmalloc.h  mangle-port.h  mc146818rtc.h

It sounds reasonable.
But I just don't want to rush into this kind of tree wide
"scrub" unless the problem is urgent.

For your problem, a simple workaround might be fine.

And there might be some reference to these mach headers in other subsystems.

Please examine them extremely carefully and do compile test with
all yes config for all the platforms.

Thomas said he is going to drop some platform support in this cycle,
so you can do less work after that.

I'll miss these header hacks anyway.

Thanks.

>
>regard
>bibo,mao
>
>> 
>>  > 
>>  > regards
>>  > bibo,mao
>>  > 
-- 
Jiaxun Yang