linux-kernel - Re: [PATCH v3 2/2] arch/*/io.h: remove ioremap

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Date:   Tue, 7 Mar 2023 09:30:43 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        linux-sh@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
        linux-mm@...ck.org, Luis Chamberlain <mcgrof@...nel.org>,
        linux-parisc@...r.kernel.org, linux-alpha@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 2/2] arch/*/io.h: remove ioremap_uc in some
 architectures

On 03/07/23 at 11:58am, Michael Ellerman wrote:
> "Arnd Bergmann" <arnd@...db.de> writes:
> > On Sun, Mar 5, 2023, at 10:29, Geert Uytterhoeven wrote:
> >> On Sun, Mar 5, 2023 at 10:23 AM Michael Ellerman <mpe@...erman.id.au> wrote:
> >>> Maybe that exact code path is only reachable on x86/ia64? But if so
> >>> please explain why.
> >>>
> >>> Otherwise it looks like this series could break that driver on powerpc
> >>> at least.
> >>
> >> Indeed.
> >
> > When I last looked into this, I sent a patch to use ioremap()
> > on non-x86:
> >
> > https://lore.kernel.org/all/20191111192258.2234502-1-arnd@arndb.de/
> 
> OK thanks.
> 
> Baoquan can you add that patch to the start of this series if/when you
> post the next version?

Sure, will do. Wondering if we need make change to cover powerpc other
than x86 and ia64 in Arnd's patch as you and Geert pointed out.