linux-kernel - drivers/hwspinlock/sprd_hwspinlock.c:141:34: warning: unused variable 'sprd_hwspinlock_of

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Message-ID: <202010180232.G5zFpVdI-lkp@intel.com>
Date:   Sun, 18 Oct 2020 02:27:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: drivers/hwspinlock/sprd_hwspinlock.c:141:34: warning: unused
 variable 'sprd_hwspinlock_of_match'

Hi Baolin,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   071a0578b0ce0b0e543d1e38ee6926b9cc21c198
commit: ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 hwspinlock: Allow drivers to be built with COMPILE_TEST
date:   7 months ago
config: x86_64-randconfig-r005-20201018 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 50cc9a0e6124f6177633b9e5edcee25860cfa094)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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/hwspinlock/sprd_hwspinlock.c:141:34: warning: unused variable 'sprd_hwspinlock_of_match' [-Wunused-const-variable]
   static const struct of_device_id sprd_hwspinlock_of_match[] = {
                                    ^
   1 warning generated.

vim +/sprd_hwspinlock_of_match +141 drivers/hwspinlock/sprd_hwspinlock.c

d8c8bbbb1aba547 Baolin Wang 2017-05-17  140  
d8c8bbbb1aba547 Baolin Wang 2017-05-17 @141  static const struct of_device_id sprd_hwspinlock_of_match[] = {
d8c8bbbb1aba547 Baolin Wang 2017-05-17  142  	{ .compatible = "sprd,hwspinlock-r3p0", },
d8c8bbbb1aba547 Baolin Wang 2017-05-17  143  	{ /* sentinel */ }
d8c8bbbb1aba547 Baolin Wang 2017-05-17  144  };
d8c8bbbb1aba547 Baolin Wang 2017-05-17  145  MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);
d8c8bbbb1aba547 Baolin Wang 2017-05-17  146  

:::::: The code at line 141 was first introduced by commit
:::::: d8c8bbbb1aba547b6c0d534f87fc68aa338658fc hwspinlock: sprd: Add hardware spinlock driver

:::::: TO: Baolin Wang <baolin.wang@...eadtrum.com>
:::::: CC: Bjorn Andersson <bjorn.andersson@...aro.org>

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

Download attachment ".config.gz" of type "application/gzip" (32293 bytes)