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

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Date:   Tue, 31 Mar 2020 11:53:41 +0800
From:   maobibo <maobibo@...ngson.cn>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
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



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

regard
bibo,mao

> 
>  > 
>  > regards
>  > bibo,mao
>  > 
>  > >> ---
>  > >> arch/mips/Kconfig                                                 | 1 +
>  > >> arch/mips/loongson64/Platform                                     | 2
>  > >> +-
>  > >> arch/mips/loongson64/env.c                                        | 8
>  > >> ++++----
>