linux-kernel - drivers/clk/pxa/clk-pxa3xx.c:167:9: sparse: sparse: Using plain integer as NULL pointer

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Message-ID: <202305111301.RAHohdob-lkp@intel.com>
Date:   Thu, 11 May 2023 13:56:58 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: drivers/clk/pxa/clk-pxa3xx.c:167:9: sparse: sparse: Using plain
 integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   80e62bc8487b049696e67ad133c503bf7f6806f7
commit: 3c816d950a494ae6e16b1fa017af29bc53cb7791 ARM: pxa: move clk register definitions to driver
date:   1 year ago
config: arm-randconfig-s053-20230511 (https://download.01.org/0day-ci/archive/20230511/202305111301.RAHohdob-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3c816d950a494ae6e16b1fa017af29bc53cb7791
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 3c816d950a494ae6e16b1fa017af29bc53cb7791
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash arch/arm/mach-lpc32xx/ arch/arm/mach-orion5x/ arch/arm/mach-spear/ arch/arm/mm/ drivers/clk/pxa/ drivers/irqchip/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305111301.RAHohdob-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/clk/pxa/clk-pxa3xx.c:167:9: sparse: sparse: Using plain integer as NULL pointer

vim +167 drivers/clk/pxa/clk-pxa3xx.c

   159	
   160	void pxa3xx_clk_update_accr(u32 disable, u32 enable, u32 xclkcfg, u32 mask)
   161	{
   162		u32 accr = readl(clk_regs + ACCR);
   163	
   164		accr &= ~disable;
   165		accr |= enable;
   166	
 > 167		writel(accr, ACCR);
   168		if (xclkcfg)
   169			__asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg));
   170	
   171		while ((readl(clk_regs + ACSR) & mask) != (accr & mask))
   172			cpu_relax();
   173	}
   174	

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