linux-kernel - Re: [PATCH v2 1/2] coresight: core: Add device name support

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Date: Tue, 16 Jan 2024 19:34:07 +0800
From: kernel test robot <lkp@...el.com>
To: Mao Jinlong <quic_jinlmao@...cinc.com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Mike Leach <mike.leach@...aro.org>,
	James Clark <james.clark@....com>, Leo Yan <leo.yan@...aro.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: oe-kbuild-all@...ts.linux.dev, Mao Jinlong <quic_jinlmao@...cinc.com>,
	coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/2] coresight: core: Add device name support

Hi Mao,

kernel test robot noticed the following build errors:

[auto build test ERROR on robh/for-next]
[also build test ERROR on linus/master v6.7 next-20240112]
[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/Mao-Jinlong/coresight-core-Add-device-name-support/20240116-004557
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20240115164252.26510-2-quic_jinlmao%40quicinc.com
patch subject: [PATCH v2 1/2] coresight: core: Add device name support
config: arm-randconfig-r081-20240116 (https://download.01.org/0day-ci/archive/20240116/202401161905.KuRUhKW4-lkp@intel.com/config)
compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project 9bde5becb44ea071f5e1fa1f5d4071dc8788b18c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240116/202401161905.KuRUhKW4-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/202401161905.KuRUhKW4-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/hwtracing/coresight/coresight-core.c:1775:7: error: assigning to 'char *' from 'const char *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
    1775 |         name = coresight_get_device_name(dev);
         |              ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +1775 drivers/hwtracing/coresight/coresight-core.c

  1758	
  1759	/*
  1760	 * coresight_alloc_device_name - Get an index for a given device in the
  1761	 * device index list specific to a driver. An index is allocated for a
  1762	 * device and is tracked with the fwnode_handle to prevent allocating
  1763	 * duplicate indices for the same device (e.g, if we defer probing of
  1764	 * a device due to dependencies), in case the index is requested again.
  1765	 */
  1766	char *coresight_alloc_device_name(struct coresight_dev_list *dict,
  1767					  struct device *dev)
  1768	{
  1769		int idx;
  1770		char *name = NULL;
  1771		struct fwnode_handle **list;
  1772	
  1773		mutex_lock(&coresight_mutex);
  1774	
> 1775		name = coresight_get_device_name(dev);
  1776		if (!name) {
  1777			idx = coresight_search_device_idx(dict, dev_fwnode(dev));
  1778			if (idx < 0) {
  1779				/* Make space for the new entry */
  1780				idx = dict->nr_idx;
  1781				list = krealloc_array(dict->fwnode_list,
  1782						      idx + 1, sizeof(*dict->fwnode_list),
  1783						      GFP_KERNEL);
  1784				if (ZERO_OR_NULL_PTR(list)) {
  1785					idx = -ENOMEM;
  1786					goto done;
  1787				}
  1788	
  1789				list[idx] = dev_fwnode(dev);
  1790				dict->fwnode_list = list;
  1791				dict->nr_idx = idx + 1;
  1792			}
  1793	
  1794			name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
  1795		}
  1796	done:
  1797		mutex_unlock(&coresight_mutex);
  1798		return name;
  1799	}
  1800	EXPORT_SYMBOL_GPL(coresight_alloc_device_name);
  1801	

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