Re: [PATCH 5/5] virtio: Add bounce DMA ops

[kbuild test robot]

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@xxxxxxxxx>

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@xxxxxxxxxxxxxx>
:::::: CC: 0day robot <lkp@xxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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