[PATCH 2/2] iommufd_driver: make IOMMUFD_DRIVER_CORE a 'bool' symbol

[Arnd Bergmann]

From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxx>
---
 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