linux-kernel - Re: [PATCH v4 8/9] MIPS: SGI-IP27: fix readb/writeb addressing

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Message-Id: <20190814134012.0a1793598a478b55f6361924@suse.de>
Date:   Wed, 14 Aug 2019 13:40:12 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Philippe Mathieu-Daudé <f4bug@...at.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jiri Slaby <jslaby@...e.com>,
        Evgeniy Polyakov <zbr@...emap.net>, linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-input <linux-input@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" 
        <linux-rtc@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v4 8/9] MIPS: SGI-IP27: fix readb/writeb addressing

On Tue, 13 Aug 2019 10:47:13 +0200
Philippe Mathieu-Daudé <f4bug@...at.org> wrote:

> Hi Thomas,
> 
> On 8/11/19 9:29 AM, Greg Kroah-Hartman wrote:
> > On Sat, Aug 10, 2019 at 04:22:23PM +0300, Andy Shevchenko wrote:
> >> On Fri, Aug 9, 2019 at 1:34 PM Thomas Bogendoerfer
> >> <tbogendoerfer@...e.de> wrote:
> >>>
> >>> Our chosen byte swapping, which is what firmware already uses, is to
> >>> do readl/writel by normal lw/sw intructions (data invariance). This
> >>> also means we need to mangle addresses for u8 and u16 accesses. The
> >>> mangling for 16bit has been done aready, but 8bit one was missing.
> >>> Correcting this causes different addresses for accesses to the
> >>> SuperIO and local bus of the IOC3 chip. This is fixed by changing
> >>> byte order in ioc3 and m48rtc_rtc structs.
> >>
> >>>  /* serial port register map */
> >>>  struct ioc3_serialregs {
> >>> -       uint32_t        sscr;
> >>> -       uint32_t        stpir;
> >>> -       uint32_t        stcir;
> >>> -       uint32_t        srpir;
> >>> -       uint32_t        srcir;
> >>> -       uint32_t        srtr;
> >>> -       uint32_t        shadow;
> >>> +       u32     sscr;
> >>> +       u32     stpir;
> >>> +       u32     stcir;
> >>> +       u32     srpir;
> >>> +       u32     srcir;
> >>> +       u32     srtr;
> >>> +       u32     shadow;
> >>>  };
> >>
> >> Isn't it a churn? AFAIU kernel documentation the uint32_t is okay to
> >> use, just be consistent inside one module / driver.
> >> Am I mistaken?
> > 
> > No, but really it uint* shouldn't be used anywhere in the kernel source
> > as it does not make sense.
> 
> If you respin your series, please send this cleanup as a separate patch.

no need for an extra patch. I realized that patch 7 in this series introduces
all of these uint32_t. So i already fixed it there.

Thomas.

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