arch/riscv/include/asm/timex.h:42:16: sparse: sparse: cast removes address space '__iomem' of expression

arch/riscv/include/asm/timex.h:42:16: sparse: sparse: cast removes address space '__iomem' of expression

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d3590ebf6f91350192737dd1d1b219c05277f067
commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces
date:   6 weeks ago
config: riscv-randconfig-s031-20200729 (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: v0.6.2-97-gee4aea9a-dirty
        git checkout 670d0a4b10704667765f7d18f7592993d02783aa
        # 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-riscv.c: note: in included file (through include/linux/timex.h, include/linux/clocksource.h):
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: cast removes address space '__iomem' of expression
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:42:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __iomem *addr @@     got unsigned int [usertype] * @@
>> arch/riscv/include/asm/timex.h:42:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:42:16: sparse:     got unsigned int [usertype] *

vim +/__iomem +42 arch/riscv/include/asm/timex.h

6d60b6ee0c9777b Palmer Dabbelt    2017-07-10  31  
6d60b6ee0c9777b Palmer Dabbelt    2017-07-10  32  #ifdef CONFIG_64BIT
2f12dbf190d97dc Christoph Hellwig 2019-08-21  33  static inline u64 get_cycles64(void)
6d60b6ee0c9777b Palmer Dabbelt    2017-07-10  34  {
6d60b6ee0c9777b Palmer Dabbelt    2017-07-10  35  	return get_cycles();
6d60b6ee0c9777b Palmer Dabbelt    2017-07-10  36  }
2f12dbf190d97dc Christoph Hellwig 2019-08-21  37  #else /* CONFIG_64BIT */
2f12dbf190d97dc Christoph Hellwig 2019-08-21  38  static inline u32 get_cycles_hi(void)
2f12dbf190d97dc Christoph Hellwig 2019-08-21  39  {
4f9bbcefa142862 Christoph Hellwig 2019-10-28  40  	if (IS_ENABLED(CONFIG_RISCV_SBI))
2f12dbf190d97dc Christoph Hellwig 2019-08-21  41  		return csr_read(CSR_TIMEH);
4f9bbcefa142862 Christoph Hellwig 2019-10-28 @42  	return mmio_get_cycles_hi();
2f12dbf190d97dc Christoph Hellwig 2019-08-21  43  }
2f12dbf190d97dc Christoph Hellwig 2019-08-21  44  

:::::: The code at line 42 was first introduced by commit
:::::: 4f9bbcefa142862782275a4b29f390ca8d8b9242 riscv: add support for MMIO access to the timer registers

:::::: TO: Christoph Hellwig <hch@lst.de>
:::::: CC: Paul Walmsley <paul.walmsley@sifive.com>

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

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