linux-kernel - Re: [PATCH v4 3/9] dmaengine: dw-edma: Export per-channel IRQ and doorbell register offset

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Message-ID: <202602081640.ChGzNbe8-lkp@intel.com>
Date: Sun, 8 Feb 2026 16:57:29 +0800
From: kernel test robot <lkp@...el.com>
To: Koichiro Den <den@...inux.co.jp>, vkoul@...nel.org, mani@...nel.org,
	Frank.Li@....com, jingoohan1@...il.com, lpieralisi@...nel.org,
	kwilczynski@...nel.org, robh@...nel.org, bhelgaas@...gle.com
Cc: oe-kbuild-all@...ts.linux.dev, dmaengine@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/9] dmaengine: dw-edma: Export per-channel IRQ and
 doorbell register offset

Hi Koichiro,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus linus/master v6.19-rc8 next-20260205]
[cannot apply to vkoul-dmaengine/next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Koichiro-Den/dmaengine-dw-edma-Add-per-channel-interrupt-routing-control/20260207-013042
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20260206172646.1556847-4-den%40valinux.co.jp
patch subject: [PATCH v4 3/9] dmaengine: dw-edma: Export per-channel IRQ and doorbell register offset
config: arc-randconfig-002-20260208 (https://download.01.org/0day-ci/archive/20260208/202602081640.ChGzNbe8-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260208/202602081640.ChGzNbe8-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602081640.ChGzNbe8-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/dma/dw-edma/dw-edma-core.c: In function 'dw_edma_chan_info':
>> drivers/dma/dw-edma/dw-edma-core.c:1109:26: warning: variable 'dchan' set but not used [-Wunused-but-set-variable]
    1109 |         struct dma_chan *dchan;
         |                          ^~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for CAN_DEV
   Depends on [n]: NETDEVICES [=n] && CAN [=y]
   Selected by [y]:
   - CAN [=y] && NET [=y]


vim +/dchan +1109 drivers/dma/dw-edma/dw-edma-core.c

  1103	
  1104	int dw_edma_chan_info(struct dw_edma_chip *chip, unsigned int ch_idx,
  1105			      struct dw_edma_chan_info *info)
  1106	{
  1107		struct dw_edma *dw = chip->dw;
  1108		struct dw_edma_chan *chan;
> 1109		struct dma_chan *dchan;
  1110		u32 ch_cnt;
  1111		int ret;
  1112	
  1113		if (!chip || !info || !dw)
  1114			return -EINVAL;
  1115	
  1116		ch_cnt = dw->wr_ch_cnt + dw->rd_ch_cnt;
  1117		if (ch_idx >= ch_cnt)
  1118			return -EINVAL;
  1119	
  1120		chan = &dw->chan[ch_idx];
  1121		dchan = &chan->vc.chan;
  1122	
  1123		ret = dw_edma_core_ch_info(dw, chan, info);
  1124		if (ret)
  1125			return ret;
  1126	
  1127		info->irq = dw->irq[chan->irq_idx].irq;
  1128		return 0;
  1129	}
  1130	EXPORT_SYMBOL_GPL(dw_edma_chan_info);
  1131	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki