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

Philip Li
2020-12-24T08:35:17Z

On Thu, Dec 24, 2020 at 04:11:17PM +0800, kernel test robot wrote:
> 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>
Hi Anup and all, kindly ignore extra reports against this commit, we will
check why it sends out ~10 duplicated reports. Sorry for the inconvenience.

Thanks

>
>
> "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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