Re: [PATCH 2/2] scsi: Align queue to ARCH_DMA_MINALIGN in non-coherent DMA mode

[kbuild test robot]

Hi Huacai,

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.13 next-20170908]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Huacai-Chen/mm-dmapool-Align-to-ARCH_DMA_MINALIGN-in-non-coherent-DMA-mode/20170909-230504
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: m68k-sun3_defconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 4.9.0
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
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   drivers/scsi/scsi_lib.c: In function '__scsi_init_queue':
   drivers/scsi/scsi_lib.c:2139:2: error: implicit declaration of function 'plat_device_is_coherent' [-Werror=implicit-function-declaration]
     if (plat_device_is_coherent(dev))
     ^
>> drivers/scsi/scsi_lib.c:2142:3: error: implicit declaration of function 'dma_get_cache_alignment' [-Werror=implicit-function-declaration]
      blk_queue_dma_alignment(q, dma_get_cache_alignment() - 1);
      ^
   cc1: some warnings being treated as errors

vim +/dma_get_cache_alignment +2142 drivers/scsi/scsi_lib.c

  2103	
  2104	void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
  2105	{
  2106		struct device *dev = shost->dma_dev;
  2107	
  2108		queue_flag_set_unlocked(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
  2109	
  2110		/*
  2111		 * this limit is imposed by hardware restrictions
  2112		 */
  2113		blk_queue_max_segments(q, min_t(unsigned short, shost->sg_tablesize,
  2114						SG_MAX_SEGMENTS));
  2115	
  2116		if (scsi_host_prot_dma(shost)) {
  2117			shost->sg_prot_tablesize =
  2118				min_not_zero(shost->sg_prot_tablesize,
  2119					     (unsigned short)SCSI_MAX_PROT_SG_SEGMENTS);
  2120			BUG_ON(shost->sg_prot_tablesize < shost->sg_tablesize);
  2121			blk_queue_max_integrity_segments(q, shost->sg_prot_tablesize);
  2122		}
  2123	
  2124		blk_queue_max_hw_sectors(q, shost->max_sectors);
  2125		blk_queue_bounce_limit(q, scsi_calculate_bounce_limit(shost));
  2126		blk_queue_segment_boundary(q, shost->dma_boundary);
  2127		dma_set_seg_boundary(dev, shost->dma_boundary);
  2128	
  2129		blk_queue_max_segment_size(q, dma_get_max_seg_size(dev));
  2130	
  2131		if (!shost->use_clustering)
  2132			q->limits.cluster = 0;
  2133	
  2134		/*
  2135		 * set a reasonable default alignment on word/cacheline boundaries:
  2136		 * the host and device may alter it using
  2137		 * blk_queue_update_dma_alignment() later.
  2138		 */
> 2139		if (plat_device_is_coherent(dev))
  2140			blk_queue_dma_alignment(q, 0x04 - 1);
  2141		else
> 2142			blk_queue_dma_alignment(q, dma_get_cache_alignment() - 1);
  2143	}
  2144	EXPORT_SYMBOL_GPL(__scsi_init_queue);
  2145	

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