linux-kernel - Re: [PATCH] udmabuf: add CONFIG

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Date: Tue, 28 May 2024 15:58:34 +0200
From: David Hildenbrand <david@...hat.com>
To: Arnd Bergmann <arnd@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Dave Airlie <airlied@...hat.com>, Vivek Kasireddy
 <vivek.kasireddy@...el.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Arnd Bergmann <arnd@...db.de>, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] udmabuf: add CONFIG_MMU dependency

Am 28.05.24 um 15:31 schrieb Arnd Bergmann:
> From: Arnd Bergmann <arnd@...db.de>
> 
> 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@...db.de>
> ---
>   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@...hat.com>

-- 
Thanks,

David / dhildenb