linux-kernel - Re: [PATCH V5 3/3] scsi: Align queue to ARCH_DMA

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Date:   Mon, 18 Sep 2017 13:28:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Huacai Chen <chenhc@...ote.com>
Cc:     kbuild-all@...org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fuxin Zhang <zhangfx@...ote.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH V5 3/3] scsi: Align queue to ARCH_DMA_MINALIGN in
 non-coherent DMA mode

Hi Huacai,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc1 next-20170915]
[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/dma-mapping-Introduce-device_is_coherent-as-a-helper/20170918-122824
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 'device_is_coherent' [-Werror=implicit-function-declaration]
     if (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 +/device_is_coherent +2139 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 (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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