linux-kernel - next-20210409 build breakage in drivers/iommu/mtk_iommu

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Message-ID: <14335.1618171663@turing-police>
Date:   Sun, 11 Apr 2021 16:07:43 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <jroedel@...e.de>,
        Will Deacon <will@...nel.org>
Cc:     iommu@...ts.linux-foundation.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: next-20210409 build breakage in drivers/iommu/mtk_iommu_v1.c

This commit:

commit 8de000cf0265eaa4f63aff9f2c7a3876d2dda9b6
Author: Yong Wu <yong.wu@...iatek.com>
Date:   Fri Mar 26 11:23:36 2021 +0800

    iommu/mediatek-v1: Allow building as module

changes drivers/iommu/Kcconfig

 config MTK_IOMMU_V1
-       bool "MTK IOMMU Version 1 (M4U gen1) Support"
+       tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"

Unfortunately, this doesn't actually build properly as a module, because:

  MODPOST modules-only.symvers
ERROR: modpost: "of_phandle_iterator_args" [drivers/iommu/mtk_iommu_v1.ko] undefined!
make[2]: *** [/usr/src/linux-next/scripts/Makefile.modpost:150: modules-only.symvers] Error 1

There's no EXPORT_SYMBOL and drivers/of/base.o is a built-in, so
the symbol isn't available to modules.

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