linux-kernel - Re: [PATCH v4 12/16] parisc: mm: Convert to GENERIC

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Date:   Fri, 17 Feb 2023 14:33:29 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Baoquan He <bhe@...hat.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Matthew Wilcox <willy@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        David Laight <David.Laight@...lab.com>,
        Stafford Horne <shorne@...il.com>,
        "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>
Subject: Re: [PATCH v4 12/16] parisc: mm: Convert to GENERIC_IOREMAP



Le 17/02/2023 à 15:21, Baoquan He a écrit :
> On 02/17/23 at 01:46pm, Christophe Leroy wrote:
>>
>>
>> Le 17/02/2023 à 14:31, Baoquan He a écrit :
>>> On 02/16/23 at 04:18pm, Arnd Bergmann wrote:
>>>> On Thu, Feb 16, 2023, at 16:02, Baoquan He wrote:
>>>>> On 02/16/23 at 01:50pm, Matthew Wilcox wrote:
>>>>> It's not if including asm-generic/iomap.h. The ARCH_HAS_IOREMAP_xx is to
>>>>> avoid redefinition there.
>>>>>
>>>>> include/asm-generic/iomap.h:
>>>>> ----
>>>>> #ifndef ARCH_HAS_IOREMAP_WC
>>>>> #define ioremap_wc ioremap
>>>>> #endif
>>>>
>>>> I'd change that to the usual '#ifndef ioremap_wc' in that case.
>>>
>>> Not sure if I got you. Kill all ARCH_HAS_IOREMAP_xxx in kernel? If yes,
>>> sounds like a good idea.
>>>
>>
>> At least kill that one at the first place in your series, and then the
>> other ones in a follow-up series maybe.
> 
> Then we can make a preparation patch to change that in iomap.h, then
> remove all ARCH_HAS_IOREMAP_WC definition in arch. I thought to let this
> patch as is,  then get rid of all ARCH_HAS_IOREMAP_xxx in a follow-up
> series. While the former is also fine to me. Thanks, Christophe.
> 
> diff --git a/include/asm-generic/iomap.h b/include/asm-generic/iomap.h
> index 08237ae8b840..5fa1e9ca951c 100644
> --- a/include/asm-generic/iomap.h
> +++ b/include/asm-generic/iomap.h
> @@ -93,7 +93,7 @@ extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
>   extern void ioport_unmap(void __iomem *);
>   #endif
>   
> -#ifndef ARCH_HAS_IOREMAP_WC
> +#ifndef ioremap_wc
>   #define ioremap_wc ioremap
>   #endif
> 
> [~]$ git grep ARCH_HAS_IOREMAP_WC
> arch/loongarch/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
> arch/mips/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
> arch/powerpc/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
> arch/x86/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
> drivers/net/ethernet/sfc/io.h:#ifdef ARCH_HAS_IOREMAP_WC
> drivers/net/ethernet/sfc/siena/io.h:#ifdef ARCH_HAS_IOREMAP_WC
> include/asm-generic/iomap.h:#ifndef ARCH_HAS_IOREMAP_WC
> 
> 

Not so many:

$ git grep ARCH_HAS_IOREMAP_WC  | grep define
arch/loongarch/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
arch/mips/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
arch/powerpc/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC
arch/x86/include/asm/io.h:#define ARCH_HAS_IOREMAP_WC

And also make sure they define ioremap_wc :

$ git grep "define ioremap_wc" `git grep -l "define ARCH_HAS_IOREMAP_WC"`
arch/loongarch/include/asm/io.h:#define ioremap_wc(offset, size)        \
arch/mips/include/asm/io.h:#define ioremap_wc(offset, size) 
                        \
arch/powerpc/include/asm/io.h:#define ioremap_wc ioremap_wc
arch/x86/include/asm/io.h:#define ioremap_wc ioremap_wc


Christophe