linux-kernel - Re: [PATCH v2 2/4] asm-generic/io.h: Remove unused generic _

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Date:   Tue, 21 Mar 2017 11:37:11 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 2/4] asm-generic/io.h: Remove unused generic
 __ioremap() definition

Hi Björn,

On Mon, Mar 20, 2017 at 7:42 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> Several arches use __ioremap() to help implement the generic ioremap(),
> ioremap_nocache(), and ioremap_wc() interfaces, but this usage is all
> inside the arch/ directory.
>
> The only __ioremap() uses outside arch/ are in the ZorroII RAM disk driver
> and some framebuffer drivers that are only buildable on m68k and powerpc,
> and they use the versions provided by those arches.
>
> There's no need for a generic version of __ioremap(), so remove it.

These all predate the ioremap_*() variants, and can be converted to
either ioremap_nocache() or ioremap_wt().

However, PPC doesn't implement ioremap_wt() yet, so asm-generic will
fall back to the less-efficient nocache variant.
PPC does support __ioremap(..., _PAGE_WRITETHRU), so adding a wrapper
is trivial.

> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>

Regardless,
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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