drivers/clocksource/timer-clint.c:72:24: sparse: sparse: cast removes address space '__iomem' of expression

From: kernel test robot <lkp@intel.com>
To: Anup Patel <anup.patel@wdc.com>
Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	Atish Patra <atish.patra@wdc.com>
Subject: drivers/clocksource/timer-clint.c:72:24: sparse: sparse: cast removes address space '__iomem' of expression
Date: Thu, 24 Dec 2020 13:43:07 +0800	[thread overview]
Message-ID: <202012241359.JlXmQ9pl-lkp@intel.com> (raw)

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   58cf05f597b03a8212d9ecf2c79ee046d3ee8ad9
commit: 2ac6795fcc085e8d03649f1bbd0d70aaff612cad clocksource/drivers: Add CLINT timer driver
date:   4 months ago
config: riscv-randconfig-s031-20201221 (attached as .config)
compiler: riscv32-linux-gcc (GCC) 9.3.0
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: v0.6.3-184-g1b896707-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2ac6795fcc085e8d03649f1bbd0d70aaff612cad
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 2ac6795fcc085e8d03649f1bbd0d70aaff612cad
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


"sparse warnings: (new ones prefixed by >>)"
>> drivers/clocksource/timer-clint.c:72:24: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/clocksource/timer-clint.c:72:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
   drivers/clocksource/timer-clint.c:72:24: sparse:     expected void const volatile [noderef] __iomem *addr
   drivers/clocksource/timer-clint.c:72:24: sparse:     got unsigned int [usertype] *
   drivers/clocksource/timer-clint.c:70:22: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/clocksource/timer-clint.c:70:22: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
   drivers/clocksource/timer-clint.c:70:22: sparse:     expected void const volatile [noderef] __iomem *addr
   drivers/clocksource/timer-clint.c:70:22: sparse:     got unsigned int [usertype] *
   drivers/clocksource/timer-clint.c:219:36: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void * @@     got struct clock_event_device [noderef] __percpu * @@
   drivers/clocksource/timer-clint.c:219:36: sparse:     expected void *
   drivers/clocksource/timer-clint.c:219:36: sparse:     got struct clock_event_device [noderef] __percpu *

vim +/__iomem +72 drivers/clocksource/timer-clint.c

    58	
    59	#ifdef CONFIG_64BIT
    60	static u64 notrace clint_get_cycles64(void)
    61	{
    62		return clint_get_cycles();
    63	}
    64	#else /* CONFIG_64BIT */
    65	static u64 notrace clint_get_cycles64(void)
    66	{
    67		u32 hi, lo;
    68	
    69		do {
    70			hi = clint_get_cycles_hi();
    71			lo = clint_get_cycles();
  > 72		} while (hi != clint_get_cycles_hi());
    73	
    74		return ((u64)hi << 32) | lo;
    75	}
    76	#endif /* CONFIG_64BIT */
    77	

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

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