linux-kernel - Re: [PATCH] hexagon: io: Define ioremap

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Message-ID: <CAMuHMdW=aFS8qm+=cwTciNBkHmbp5f7S8PVhus7E3MEoJT-qkw@mail.gmail.com>
Date:   Tue, 10 Dec 2019 09:45:35 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Brian Cain <bcain@...eaurora.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tuowen Zhao <ztuowen@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH] hexagon: io: Define ioremap_uc to fix build error

Hi Günter,

On Tue, Dec 10, 2019 at 9:23 AM Guenter Roeck <linux@...ck-us.net> wrote:
> On 12/10/19 12:09 AM, Geert Uytterhoeven wrote:
> > On Wed, Dec 4, 2019 at 2:34 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >> ioremap_uc is now mandatory.
> >>
> >> lib/devres.c:44:3: error: implicit declaration of function 'ioremap_uc'
> >>
> >> Fixes: e537654b7039 ("lib: devres: add a helper function for ioremap_uc")
> >> Cc: Tuowen Zhao <ztuowen@...il.com>
> >> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> >> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> >> Cc: Luis Chamberlain <mcgrof@...nel.org>
> >> Cc: Lee Jones <lee.jones@...aro.org>
> >> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> >> ---
> >>   arch/hexagon/include/asm/io.h | 2 +-
> >>   1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
> >> index 539e3efcf39c..39e5605c5d42 100644
> >> --- a/arch/hexagon/include/asm/io.h
> >> +++ b/arch/hexagon/include/asm/io.h
> >> @@ -173,7 +173,7 @@ static inline void writel(u32 data, volatile void __iomem *addr)
> >>
> >>   void __iomem *ioremap(unsigned long phys_addr, unsigned long size);
> >>   #define ioremap_nocache ioremap
> >> -
> >> +#define ioremap_uc ioremap
> >>
> >>   #define __raw_writel writel
> >
> > Do we really need this? There is only one user of ioremap_uc(), which
> > Christoph is trying hard to get rid of, and the new devres helper that
> > triggers all of this :-(
> > https://lore.kernel.org/dri-devel/20191112105507.GA7122@lst.de/
>
> One may ask why we needed a devres helper in the first place if there
> is indeed just one user.

Because of the new second user, which jumped on the devres train...
a8ff78f7f773142e ("mfd: intel-lpss: Use devm_ioremap_uc for MMIO").

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds