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

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Message-ID: <20170321195923.GC5073@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 21 Mar 2017 14:59:23 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, 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

On Tue, Mar 21, 2017 at 11:37:11AM +0100, Geert Uytterhoeven wrote:
> 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.

Thanks, I'll try adding ioremap_wt() (at least for PPC32) and cleaning this
up.

> > 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