linux-kernel - Re: [PATCH 03/21] ia64: rename ioremap_nocache to ioremap

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Date:   Mon, 11 Nov 2019 11:36:22 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Guo Ren <guoren@...nel.org>, Michal Simek <monstr@...str.eu>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Guan Xuetao <gxt@....edu.cn>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        alpha <linux-alpha@...r.kernel.org>,
        "open list:SYNOPSYS ARC ARCHITECTURE" 
        <linux-snps-arc@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:QUALCOMM HEXAGON..." <linux-hexagon@...r.kernel.org>,
        linux-ia64@...r.kernel.org,
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        linux-mips@...r.kernel.org,
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Subject: Re: [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc

On Tue, Oct 29, 2019 at 7:48 AM Christoph Hellwig <hch@....de> wrote:
>
> On ia64 ioremap_nocache fails if attributes don't match.  Not other
> architectures does this, and we plan to get rid of ioremap_nocache.
> So get rid of the special semantics and define ioremap_nocache in
> terms of ioremap as no portable driver could rely on the behavior
> anyway.
>
> However x86 implements ioremap_uc in a similar way as the ia64
> version of ioremap_nocache, in that it ignores the firmware tables.
> Switch ia64 to override ioremap_uc instead.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Good idea,

Reviewed-by: Arnd Bergmann <arnd@...db.de>