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    SubjectRe: [PATCH 5/5] virtio: Add bounce DMA ops
    Hi Srivatsa,

    Thank you for the patch! Perhaps something to improve:

    [auto build test WARNING on vhost/linux-next]
    [also build test WARNING on xen-tip/linux-next linus/master v5.7-rc3 next-20200428]
    [cannot apply to swiotlb/linux-next]
    [if your patch is applied to the wrong git tree, please drop us a note to help
    improve the system. BTW, we also suggest to use '--base' option to specify the
    base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

    url: https://github.com/0day-ci/linux/commits/Srivatsa-Vaddagiri/virtio-on-Type-1-hypervisor/20200429-032334
    base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
    config: sh-randconfig-a001-20200428 (attached as .config)
    compiler: sh4-linux-gcc (GCC) 9.3.0
    reproduce:
    wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
    chmod +x ~/bin/make.cross
    # save the attached .config to linux build tree
    COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=sh

    If you fix the issue, kindly add following tag as appropriate
    Reported-by: kbuild test robot <lkp@intel.com>

    All warnings (new ones prefixed by >>):

    In file included from drivers/virtio/virtio_bounce.c:13:
    include/linux/swiotlb.h: In function 'swiotlb_alloc':
    include/linux/swiotlb.h:234:9: error: 'DMA_MAPPING_ERROR' undeclared (first use in this function)
    234 | return DMA_MAPPING_ERROR;
    | ^~~~~~~~~~~~~~~~~
    include/linux/swiotlb.h:234:9: note: each undeclared identifier is reported only once for each function it appears in
    >> include/linux/swiotlb.h:235:1: warning: control reaches end of non-void function [-Wreturn-type]
    235 | }
    | ^

    vim +235 include/linux/swiotlb.h

    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 229
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 230 static inline phys_addr_t swiotlb_alloc(struct swiotlb_pool *pool,
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 231 size_t alloc_size, unsigned long tbl_dma_addr,
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 232 unsigned long mask)
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 233 {
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 234 return DMA_MAPPING_ERROR;
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 @235 }
    9ab4c39d9f9298 Srivatsa Vaddagiri 2020-04-28 236

    :::::: The code at line 235 was first introduced by commit
    :::::: 9ab4c39d9f929840cb884e589f6112770dbc2f63 swiotlb: Add alloc and free APIs

    :::::: TO: Srivatsa Vaddagiri <vatsa@codeaurora.org>
    :::::: CC: 0day robot <lkp@intel.com>

    ---
    0-DAY CI Kernel Test Service, Intel Corporation
    https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
    [unhandled content-type:application/gzip]
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