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Date:   Tue, 17 Nov 2020 19:39:25 +0100
From:   Heiko Carstens <hca@linux.ibm.com>
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     Arnd Bergmann <arnd@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Randy Dunlap <rdunlap@infradead.org>,
        kernel test robot <lkp@intel.com>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>, kbuild-all@lists.01.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Marc Zyngier <maz@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        linux-s390 <linux-s390@vger.kernel.org>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: irq-loongson-pch-pic.c:undefined reference to `of_iomap'
Message-ID: <20201117183925.GC4746@osiris>
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On Tue, Nov 17, 2020 at 07:34:55PM +0100, Krzysztof Kozlowski wrote:
> > Looking a bit further, I now find that we ended up disabling CONFIG_COMPILE_TEST
> > entirely for arch/um, which is clearly an option that would also work for s390.
> 
> Yes, that was the easier solution than to spread "depends on HAS_IOMEM"
> all over Kconfigs.
> 
> +Cc Greg KH,
> 
> I got similar report around phy drivers:
> https://lore.kernel.org/lkml/202011140335.tceVqHmN-lkp@intel.com/
> 
> When reproducing this, I saw multiple unmet dependencies on s390 for
> MFD_SYSCON and MFD_STM32_TIMERS.
> 
> I suppose there is no point to fix them all because this will be
> basically UML case, so HAS_IOMEM all over the tree.

FWIW, I just replied a couple of minutes, but you might have missed
that:
---
I'll add a patch to the s390 tree which disables CONFIG_COMPILE_TEST
for s390. I wouldn't like to start again chasing/adding missing
'select' or 'depends on' statements in various config files.
---