Re: [PATCH] udmabuf: add CONFIG_MMU dependency

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Am 28.05.24 um 15:31 schrieb Arnd Bergmann:
From: Arnd Bergmann <arnd@xxxxxxxx>

There is no !CONFIG_MMU version of vmf_insert_pfn():

arm-linux-gnueabi-ld: drivers/dma-buf/udmabuf.o: in function `udmabuf_vm_fault':
udmabuf.c:(.text+0xaa): undefined reference to `vmf_insert_pfn'

Fixes: f7254e043ff1 ("udmabuf: use vmf_insert_pfn and VM_PFNMAP for handling mmap")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
  drivers/dma-buf/Kconfig | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index e4dc53a36428..b46eb8a552d7 100644
--- a/drivers/dma-buf/Kconfig
+++ b/drivers/dma-buf/Kconfig
@@ -35,6 +35,7 @@ config UDMABUF
  	default n
  	depends on DMA_SHARED_BUFFER
  	depends on MEMFD_CREATE || COMPILE_TEST
+	depends on MMU
  	help
  	  A driver to let userspace turn memfd regions into dma-bufs.
  	  Qemu can use this to create host dmabufs for guest framebuffers.

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Thanks,

David / dhildenb





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