linux-kernel - arch/arc/kernel/devtree.c:64:23: warning: variable 'dt

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Message-ID: <202401252355.5NfsqG3G-lkp@intel.com>
Date: Thu, 25 Jan 2024 23:21:22 +0800
From: kernel test robot <lkp@...el.com>
To: Alexey Brodkin <abrodkin@...opsys.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-snps-arc@...ts.infradead.org,
	Vineet Gupta <vgupta@...opsys.com>
Subject: arch/arc/kernel/devtree.c:64:23: warning: variable 'dt_root' set but
 not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6098d87eaf31f48153c984e2adadf14762520a87
commit: 6e9318d1be83714e004a0ac795a936df4d2bed3e ARC: RIP arc_{get|set}_core_freq() clk API
date:   8 years ago
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20240125/202401252355.5NfsqG3G-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240125/202401252355.5NfsqG3G-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/202401252355.5NfsqG3G-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:11,
                    from include/asm-generic/bug.h:13,
                    from arch/arc/include/asm/bug.h:31,
                    from include/linux/bug.h:4,
                    from include/linux/thread_info.h:11,
                    from include/asm-generic/current.h:4,
                    from arch/arc/include/asm/current.h:23,
                    from include/linux/mutex.h:13,
                    from include/linux/notifier.h:13,
                    from include/linux/reboot.h:5,
                    from arch/arc/kernel/devtree.c:13:
   include/linux/log2.h:22:1: warning: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Wattributes]
      22 | int ____ilog2_NaN(void);
         | ^~~
   arch/arc/kernel/devtree.c: In function 'setup_machine_fdt':
>> arch/arc/kernel/devtree.c:64:23: warning: variable 'dt_root' set but not used [-Wunused-but-set-variable]
      64 |         unsigned long dt_root;
         |                       ^~~~~~~


vim +/dt_root +64 arch/arc/kernel/devtree.c

880beb8807814c Rob Herring  2013-08-27  53  
999159a5381bff Vineet Gupta 2013-01-22  54  /**
999159a5381bff Vineet Gupta 2013-01-22  55   * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
999159a5381bff Vineet Gupta 2013-01-22  56   * @dt:		virtual address pointer to dt blob
999159a5381bff Vineet Gupta 2013-01-22  57   *
999159a5381bff Vineet Gupta 2013-01-22  58   * If a dtb was passed to the kernel, then use it to choose the correct
999159a5381bff Vineet Gupta 2013-01-22  59   * machine_desc and to setup the system.
999159a5381bff Vineet Gupta 2013-01-22  60   */
880beb8807814c Rob Herring  2013-08-27  61  const struct machine_desc * __init setup_machine_fdt(void *dt)
999159a5381bff Vineet Gupta 2013-01-22  62  {
880beb8807814c Rob Herring  2013-08-27  63  	const struct machine_desc *mdesc;
999159a5381bff Vineet Gupta 2013-01-22 @64  	unsigned long dt_root;

:::::: The code at line 64 was first introduced by commit
:::::: 999159a5381bff3bd6f688c5d20fbec9d8789e53 ARC: [DeviceTree] Basic support

:::::: TO: Vineet Gupta <vgupta@...opsys.com>
:::::: CC: Vineet Gupta <vgupta@...opsys.com>

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