linux-kernel - [PATCH 2/2] iommufd_driver: make IOMMUFD_DRIVER

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Message-Id: <20250324210329.2809869-2-arnd@kernel.org>
Date: Mon, 24 Mar 2025 22:03:23 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Kevin Tian <kevin.tian@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Nicolin Chen <nicolinc@...dia.com>,
	Robin Murphy <robin.murphy@....com>
Cc: Arnd Bergmann <arnd@...db.de>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] iommufd_driver: make IOMMUFD_DRIVER_CORE a 'bool' symbol

From: Arnd Bergmann <arnd@...db.de>

Calling iommufd_sw_msi() from iommu_dma_prepare_msi() in the iommu core
code is no longer possible if the driver core is in a loadable module
because it is now a direct call rather than a function pointer:

arm-linux-gnueabi-ld: drivers/iommu/iommu.o: in function `iommu_dma_prepare_msi':
iommu.c:(.text+0x4fb4): undefined reference to `iommufd_sw_msi'

This effectively makes the iommu driver core part of the iommu subsystem
itself, so disallow building it as a loadable module.

Fixes: e009e088d88e ("iommu: Drop sw_msi from iommu_domain")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/iommu/iommufd/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/Kconfig b/drivers/iommu/iommufd/Kconfig
index 0a07f9449fd9..2beeb4f60ee5 100644
--- a/drivers/iommu/iommufd/Kconfig
+++ b/drivers/iommu/iommufd/Kconfig
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 config IOMMUFD_DRIVER_CORE
-	tristate
+	bool
 	default (IOMMUFD_DRIVER || IOMMUFD) if IOMMUFD!=n
 
 config IOMMUFD
-- 
2.39.5