linux-kernel - Re: [PATCH v2] um: add dummy ioremap and iounmap functions

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Date:   Sat, 27 May 2017 12:15:50 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Richard Weinberger <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
        Stephen Bates <sbates@...thlin.com>,
        Jeff Dike <jdike@...toit.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] um: add dummy ioremap and iounmap functions

Hi,

On 27/05/17 12:08 PM, Geert Uytterhoeven wrote:
> Still, those code patch could be protected by #ifdef CONFIG_HAS_IOMEM,
> or better, if (IS_ENABLED(CONFIG_HAS_IOMEM)).

Well I think it would have to be the former seeing the latter would
still end up trying to compile the missing function. But having ifdefs
inside code is not generally seen as good idea[1].

I'd really like to go forward with either this patch or something like
it. The other two arches that have this problem are fine with merging a
fix and adding ifdefs to work around a single arch doesn't feel right to me.

Thanks,

Logan

[1] http://yarchive.net/comp/linux/ifdefs.html