linux-kernel - Re: [PATCH] sh: make !MMU iounmap an inline function

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Message-ID: <CAMuHMdW-8HaQip+DT5W2Owq8M8kbYwHsf8_Zd-5rRfSjSjK0=g@mail.gmail.com>
Date:   Tue, 19 Apr 2022 11:42:14 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc:     Vincent Whitchurch <vincent.whitchurch@...s.com>, kernel@...s.com,
        Christoph Hellwig <hch@....de>,
        kernel test robot <lkp@...el.com>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Landley <rob@...dley.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] sh: make !MMU iounmap an inline function

Hi Rich, Sato-san,

On Sat, Apr 16, 2022 at 12:01 AM Rob Landley <rob@...dley.net> wrote:
> On 4/14/22 03:12, Vincent Whitchurch wrote:
> > The current definition of sh's !MMU iounmap makes it unusable in certain
> > kinds of code, such as this instance caught by 0day on a patch posted to
> > the mailing lists:
> >
> >  In file included from include/linux/io.h:13,
> >                   from drivers/mtd/devices/phram.c:21:
> >  drivers/mtd/devices/phram.c: In function 'register_device':
> >  arch/sh/include/asm/io.h:274:33: error: expected expression before 'do'
> >    274 | #define iounmap(addr)           do { } while (0)
> >        |                                 ^~
> >  drivers/mtd/devices/phram.c:150:44: note: in expansion of macro 'iounmap'
> >    150 |         cached ? memunmap(new->mtd.priv) : iounmap(new->mtd.priv);
> >        |                                            ^~~~~~~
> >
> > Make it an inline function as it was earlier.
> >
> > Link: https://lore.kernel.org/lkml/202204131446.omJ5mC54-lkp@intel.com/
> > Fixes: 13f1fc870dd747131 ("sh: move the ioremap implementation out of line")
> > Reported-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
>
> Tested-by: Rob Landley <rob@...dley.net>
>
> Worked For Me.

Can we please get any of [1], [2], [3], or [4] applied and sent
upstream, so people can stop wasting time on recreating and
resubmitting similar patches all the time?

Thank you!

[1] PATCH] sh: Fix set but not used warnings with !CONFIG_MMU
    https://lore.kernel.org/r/20201208182117.163642-2-sam@ravnborg.org
[2] [PATCH] sh: make iounmap() a static inline again
    https://lore.kernel.org/r/20220105085746.1116726-1-mkl@pengutronix.de
[3] [PATCH] sh: Convert nommu io{re,un}map() to static inline functions
    https://lore.kernel.org/r/4ed0a7a0d3fa912a5b44c451884818f2c138ef42.1644914600.git.geert+renesas@glider.be/
[4] [PATCH] sh: make !MMU iounmap an inline function
    https://lore.kernel.org/r/20220414081257.1487499-1-vincent.whitchurch@axis.com/

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