Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: About commit "io: change inX() to have their own IO barrier
 overrides"
From:   John Garry <john.garry@huawei.com>
To:     Arnd Bergmann <arnd@arndb.de>
CC:     linux-arch <linux-arch@vger.kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Sinan Kaya <okaya@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        "xuwei (O)" <xuwei5@hisilicon.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Will Deacon <will@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
References: <2e80d7bc-32a0-cc40-00a9-8a383a1966c2@huawei.com>
 <c1489f55-369d-2cff-ff36-b10fb5d3ee79@kernel.org>
 <8207cd51-5b94-2f15-de9f-d85c9c385bca@huawei.com>
 <6115fa56-a471-1e9f-edbb-e643fa4e7e11@kernel.org>
 <7c955142-1fcb-d99e-69e4-1e0d3d9eb8c3@huawei.com>
 <CAK8P3a0f9hnKGd6GJ8qFZSu+J-n4fY23TCGxQkmgJaxbpre50Q@mail.gmail.com>
 <90af535f-00ef-c1e3-ec20-aae2bd2a0d88@kernel.org>
 <CAK8P3a2Grd0JsBNsB19oAxrAFtOdpvjrpGcfeArKe7zD_jrUZw@mail.gmail.com>
 <ae0a1bf1-948f-7df0-9efb-cd1e94e27d2d@huawei.com>
 <CAK8P3a2wdCrBP=a8ZypWoC=HyCU3oYYNeCddWM7oT+xM9gTPhw@mail.gmail.com>
 <182a37c2-7437-b1bd-8b86-5c9ce2e29f00@huawei.com>
 <CAK8P3a22fEGdVKVVs_40Rc_vs9SQ2ikejwMtFpyR_o+74utWaA@mail.gmail.com>
 <15e7158d-184d-9591-89a6-cd6b10ef054d@huawei.com>
Message-ID: <96b407eb-f9cd-960c-02e5-5e2a4ece33d8@huawei.com>
Date:   Wed, 11 Mar 2020 16:12:58 +0000
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
 Thunderbird/68.1.2
MIME-Version: 1.0
In-Reply-To: <15e7158d-184d-9591-89a6-cd6b10ef054d@huawei.com>
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 06/03/2020 16:43, John Garry wrote:
> 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.
> 

I think that it hasn't been mentioned already, but it looks like the 
outX methods also need the same treatment, from a7851aa54c.

thanks,
John