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

kernel test robot
2020-12-24T08:13:00Z

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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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