linux-kernel - arch/arm/mach-s3c/s3c24xx.c:177:16: warning: variable 'tmp' set but not used

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Date:   Sun, 15 Aug 2021 16:16:55 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>
Subject: arch/arm/mach-s3c/s3c24xx.c:177:16: warning: variable 'tmp' set but
 not used

Hi Arnd,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0aa78d17099b04fd9d36fe338af48ad6fe2d7fca
commit: 71b9114d2c13a648fbe6523dd859e611c316ad90 ARM: s3c: move into a common directory
date:   12 months ago
config: arm-randconfig-r023-20210815 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c)
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=71b9114d2c13a648fbe6523dd859e611c316ad90
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 71b9114d2c13a648fbe6523dd859e611c316ad90
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

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 >>):

>> arch/arm/mach-s3c/s3c24xx.c:177:16: warning: variable 'tmp' set but not used [-Wunused-but-set-variable]
           unsigned long tmp = 0;
                         ^
   1 warning generated.
--
>> arch/arm/mach-s3c/gpio-samsung.c:1309:14: warning: no previous prototype for function 's3c2410_modify_misccr' [-Wmissing-prototypes]
   unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
                ^
   arch/arm/mach-s3c/gpio-samsung.c:1309:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
   ^
   static 
   1 warning generated.


vim +/tmp +177 arch/arm/mach-s3c/s3c24xx.c

68d9ab394f06f9 arch/arm/mach-s3c2410/cpu.c    Ben Dooks     2006-06-24  174  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  175  static void s3c24xx_default_idle(void)
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  176  {
813f13e7d6ad23 arch/arm/mach-s3c24xx/common.c Cong Ding     2013-01-18 @177  	unsigned long tmp = 0;
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  178  	int i;
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  179  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  180  	/* idle the system by using the idle mode which will wait for an
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  181  	 * interrupt to happen before restarting the system.
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  182  	 */
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  183  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  184  	/* Warning: going into idle state upsets jtag scanning */
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  185  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  186  	__raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  187  		     S3C2410_CLKCON);
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  188  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  189  	/* the samsung port seems to do a loop and then unset idle.. */
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  190  	for (i = 0; i < 50; i++)
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  191  		tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  192  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  193  	/* this bit is not cleared on re-start... */
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  194  
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  195  	__raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  196  		     S3C2410_CLKCON);
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  197  }
92311272c1a514 arch/arm/plat-s3c24xx/cpu.c    Nicolas Pitre 2011-08-03  198  

:::::: The code at line 177 was first introduced by commit
:::::: 813f13e7d6ad239bb1003041f4cfae13ae27b14d ARM: S3C24XX: fix uninitialized variable warning

:::::: TO: Cong Ding <dinggnu@...il.com>
:::::: CC: Kukjin Kim <kgene.kim@...sung.com>

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

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