linux-kernel - drivers/hwspinlock/omap_hwspinlock.c:165:34: warning: unused variable 'omap_hwspinlock_of

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Date:   Tue, 15 Sep 2020 10:01:41 +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/omap_hwspinlock.c:165:34: warning: unused
 variable 'omap_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:   7fe10096c1508c7f033d34d0741809f8eecc1ed4
commit: ffd0bbfb378ecd56eac22bf932ccdbf89ac7f725 hwspinlock: Allow drivers to be built with COMPILE_TEST
date:   6 months ago
:::::: branch date: 23 hours ago
:::::: commit date: 6 months ago
config: x86_64-randconfig-a015-20200910 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 0a5dc7effb191eff740e0e7ae7bd8e1f6bdb3ad9)
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
        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/omap_hwspinlock.c:165:34: warning: unused variable 'omap_hwspinlock_of_match' [-Wunused-const-variable]
   static const struct of_device_id omap_hwspinlock_of_match[] = {
                                    ^
   1 warning generated.

# 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
vim +/omap_hwspinlock_of_match +165 drivers/hwspinlock/omap_hwspinlock.c

70ba4cc26b9f53 Simon Que  2011-02-17  164  
65bd4341d61678 Suman Anna 2015-03-04 @165  static const struct of_device_id omap_hwspinlock_of_match[] = {
65bd4341d61678 Suman Anna 2015-03-04  166  	{ .compatible = "ti,omap4-hwspinlock", },
6fa154e282f9c8 Suman Anna 2019-05-30  167  	{ .compatible = "ti,am654-hwspinlock", },
65bd4341d61678 Suman Anna 2015-03-04  168  	{ /* end */ },
65bd4341d61678 Suman Anna 2015-03-04  169  };
65bd4341d61678 Suman Anna 2015-03-04  170  MODULE_DEVICE_TABLE(of, omap_hwspinlock_of_match);
65bd4341d61678 Suman Anna 2015-03-04  171  

:::::: The code at line 165 was first introduced by commit
:::::: 65bd4341d61678494ea14994d0d7df73644ca014 hwspinlock/omap: add support for dt nodes

:::::: TO: Suman Anna <s-anna@...com>
:::::: CC: Ohad Ben-Cohen <ohad@...ery.com>

---
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" (40353 bytes)