linux-kernel - Re: [kbuild-all] drivers/clocksource/timer-clint.c:72:24: sparse: sparse: cast removes address space '_

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Date:   Thu, 24 Dec 2020 16:30:36 +0800
From:   Philip Li <philip.li@...el.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Anup Patel <anup.patel@....com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Atish Patra <atish.patra@....com>
Subject: Re: [kbuild-all] drivers/clocksource/timer-clint.c:72:24: sparse:
 sparse: cast removes address space '__iomem' of expression

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@...el.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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