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Message-ID: <ZR+/2jUUpJu74k1X@alpha.franken.de>
Date: Fri, 6 Oct 2023 10:05:46 +0200
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Baoquan He <bhe@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
linux-mm@...ck.org, akpm@...ux-foundation.org, arnd@...db.de,
jiaxun.yang@...goat.com, mpe@...erman.id.au, geert@...ux-m68k.org,
mcgrof@...nel.org, hch@...radead.org, f.fainelli@...il.com,
deller@....de, linux-alpha@...r.kernel.org,
linux-hexagon@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org
Subject: Re: [PATCH v5 3/4] arch/*/io.h: remove ioremap_uc in some
architectures
On Thu, Sep 21, 2023 at 07:04:23PM +0800, Baoquan He wrote:
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior. So remove the ioremap_uc() definition in architecutures
> other than x86 and ia64. These architectures all have asm-generic/io.h
> included and will have the default ioremap_uc() definition which
> returns NULL.
>
> This changes the existing behaviour, while no need to worry about
> any breakage because in the only callsite of ioremap_uc(), code
> has been adjusted to eliminate the impact. Please see
> atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c.
>
> If any new invocation of ioremap_uc() need be added, please consider
> using ioremap() intead or adding a ARCH specific version if necessary.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
> Acked-by: Helge Deller <deller@....de> # parisc
> Cc: linux-alpha@...r.kernel.org
> Cc: linux-hexagon@...r.kernel.org
> Cc: linux-m68k@...ts.linux-m68k.org
> Cc: linux-mips@...r.kernel.org
> Cc: linux-parisc@...r.kernel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-sh@...r.kernel.org
> Cc: sparclinux@...r.kernel.org
> ---
> Documentation/driver-api/device-io.rst | 9 +++++----
> arch/alpha/include/asm/io.h | 1 -
> arch/hexagon/include/asm/io.h | 3 ---
> arch/m68k/include/asm/kmap.h | 1 -
> arch/mips/include/asm/io.h | 1 -
Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
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