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

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Date:   Sun, 11 Aug 2019 09:29:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Thomas Bogendoerfer <tbogendoerfer@...e.de>,
        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 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.

thanks,

greg k-h