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Subject: Re: About commit "io: change inX() to have their own IO barrier
 overrides"
To:     Arnd Bergmann <arnd@arndb.de>
CC:     Sinan Kaya <okaya@kernel.org>, "xuwei (O)" <xuwei5@hisilicon.com>,
        "Bjorn Helgaas" <bhelgaas@google.com>,
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        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        linux-arch <linux-arch@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>
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From:   John Garry <john.garry@huawei.com>
Message-ID: <15e7158d-184d-9591-89a6-cd6b10ef054d@huawei.com>
Date:   Fri, 6 Mar 2020 16:43:46 +0000
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On 06/03/2020 16:29, Arnd Bergmann wrote:
>> The idea is good, but it would be nice if we just somehow use a common
>> asm-generic io.h definition directly in logic_pio.c, like:
>>
>> asm-generic io.h:
>>
>> #ifndef __raw_inw // name?
>> #define __raw_inw __raw_inw
>> static inline u16 __raw_inw(unsigned long addr)
>> {
>>          u16 val;
>>
>>          __io_pbr();
>>          val = __le16_to_cpu(__raw_readw(addr));
>>          __io_par(val);
>>          return val;
>> }
>> #endif
>>
>> #include <linux/logic_pio.h>
>>
>> #ifndef inw
>> #define inw __raw_inw
>> #endif
> Yes, makes sense. Maybe __arch_inw() then? Not great either, but I think
> that's better than __raw_inw() because __raw_* would sound like it
> mirrors __raw_readl() that lacks the barriers and byteswaps.

Right, I had the same concern. And maybe the "arch" prefix is 
misleading. Just __inw could be ok, and hopefully not conflict with the 
arch/arm/mach-* definitions.

Thanks,
John