linux-kernel - drivers/gpu/drm/rockchip/cdn-dp-core.c:54:34: warning: unused variable 'cdn_dp_dt

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Date:   Wed, 15 Dec 2021 16:22:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: drivers/gpu/drm/rockchip/cdn-dp-core.c:54:34: warning: unused
 variable 'cdn_dp_dt_ids'

Hi Robin,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5472f14a37421d1bca3dddf33cabd3bd6dbefbbc
commit: b4ceb4a5359ed1c9ba4a20acf3a70d4bbead3248 iommu: Tidy up Kconfig for SoC IOMMUs
date:   1 year, 5 months ago
config: x86_64-buildonly-randconfig-r004-20211215 (https://download.01.org/0day-ci/archive/20211215/202112151637.BKx0hSTS-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a2ddb6c8ac29412b1361810972e15221fa021c)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4ceb4a5359ed1c9ba4a20acf3a70d4bbead3248
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b4ceb4a5359ed1c9ba4a20acf3a70d4bbead3248
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/rockchip/ kernel/sched/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/rockchip/cdn-dp-core.c:54:34: warning: unused variable 'cdn_dp_dt_ids' [-Wunused-const-variable]
   static const struct of_device_id cdn_dp_dt_ids[] = {
                                    ^
   1 warning generated.


vim +/cdn_dp_dt_ids +54 drivers/gpu/drm/rockchip/cdn-dp-core.c

1a0f7ed3abe29c Chris Zhong 2017-02-05  53  
1a0f7ed3abe29c Chris Zhong 2017-02-05 @54  static const struct of_device_id cdn_dp_dt_ids[] = {
1a0f7ed3abe29c Chris Zhong 2017-02-05  55  	{ .compatible = "rockchip,rk3399-cdn-dp",
1a0f7ed3abe29c Chris Zhong 2017-02-05  56  		.data = (void *)&rk3399_cdn_dp },
1a0f7ed3abe29c Chris Zhong 2017-02-05  57  	{}
1a0f7ed3abe29c Chris Zhong 2017-02-05  58  };
1a0f7ed3abe29c Chris Zhong 2017-02-05  59  

:::::: The code at line 54 was first introduced by commit
:::::: 1a0f7ed3abe29cff8e652c69a8ad89aec2c40f00 drm/rockchip: cdn-dp: add cdn DP support for rk3399

:::::: TO: Chris Zhong <zyw@...k-chips.com>
:::::: CC: Mark Yao <mark.yao@...k-chips.com>

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