# \[PATCH 5.12 012/161\] vfio/pci: zap\_vma\_ptes() needs MMU

- From: Greg Kroah-Hartman \<gregkh@linuxfoundation.org\>
- Date: 2021-06-08 19:15:37 
- List: stable
- Page: https://ratatoskr.run/stable/2021/06/1407371
- Thread: https://ratatoskr.run/stable/2021/06/1407342/t.md

```text
From: Randy Dunlap <rdunlap@infradead.org>

[ Upstream commit 2a55ca37350171d9b43d561528f23d4130097255 ]

zap_vma_ptes() is only available when CONFIG_MMU is set/enabled.
Without CONFIG_MMU, vfio_pci.o has build errors, so make
VFIO_PCI depend on MMU.

riscv64-linux-ld: drivers/vfio/pci/vfio_pci.o: in function `vfio_pci_mmap_open':
vfio_pci.c:(.text+0x1ec): undefined reference to `zap_vma_ptes'
riscv64-linux-ld: drivers/vfio/pci/vfio_pci.o: in function `.L0 ':
vfio_pci.c:(.text+0x165c): undefined reference to `zap_vma_ptes'

Fixes: 11c4cd07ba11 ("vfio-pci: Fault mmaps to enable vma tracking")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <redacted>
Cc: Alex Williamson <redacted>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: <redacted>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Eric Auger <eric.auger@redhat.com>
Message-Id: [ref]
Signed-off-by: Alex Williamson <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/vfio/pci/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 4abddbebd4b2..c691127bc805 100644
--- a/drivers/vfio/pci/Kconfig
+++ b/drivers/vfio/pci/Kconfig
@@ -2,6 +2,7 @@
 config VFIO_PCI
 	tristate "VFIO support for PCI devices"
 	depends on VFIO && PCI && EVENTFD
+	depends on MMU
 	select VFIO_VIRQFD
 	select IRQ_BYPASS_MANAGER
 	help
-- 
2.30.2



```