linux-kernel - dfl-afu-dma-region.c:undefined reference to `dma_direct_map

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Date:   Sun, 6 Jan 2019 15:56:21 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: dfl-afu-dma-region.c:undefined reference to `dma_direct_map_page'

Hi Christoph,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b5aef86e089a2d85a6d627372287785d08938cbe
commit: 356da6d0cde3323236977fce54c1f9612a742036 dma-mapping: bypass indirect calls for dma-direct
date:   3 weeks ago
config: um-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 356da6d0cde3323236977fce54c1f9612a742036
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   arch/um/drivers/vde.o: In function `vde_open_real':
   (.text+0x951): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   (.text+0x79c): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/vector_user.o: In function `user_init_socket_fds':
   vector_user.c:(.text+0x334): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/pcap.o: In function `pcap_nametoaddr':
   (.text+0xdee5): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/pcap.o: In function `pcap_nametonetaddr':
   (.text+0xdf85): warning: Using 'getnetbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/pcap.o: In function `pcap_nametoproto':
   (.text+0xe1a5): warning: Using 'getprotobyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   arch/um/drivers/pcap.o: In function `pcap_nametoport':
   (.text+0xdfd7): warning: Using 'getservbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
   drivers/dma-buf/udmabuf.o: In function `map_udmabuf':
   udmabuf.c:(.text+0x316): undefined reference to `dma_direct_map_sg'
   drivers/fpga/dfl-afu-dma-region.o: In function `afu_dma_map_region':
>> dfl-afu-dma-region.c:(.text+0xe56): undefined reference to `dma_direct_map_page'
   collect2: error: ld returned 1 exit status

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