arch/riscv/include/asm/timex.h:25:16: sparse: sparse: cast removes address space '__iomem' of expression

[kernel test robot <lkp@intel.com>]

Hi Yimin,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2ccdd1b13c591d306f0401d98dedc4bdcd02b421
commit: b5e2c507b06c9d36411845149162a804ae7b04a9 riscv: Kconfig: Allow RV32 to build with no MMU
date:   5 months ago
config: riscv-randconfig-r073-20230815 (https://download.01.org/0day-ci/archive/20230815/202308150611.CcCG8SBw-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230815/202308150611.CcCG8SBw-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308150611.CcCG8SBw-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   WARNING: invalid argument to '-march': '_zihintpause'
   fs/ext4/mballoc.c: note: in included file (through include/linux/timex.h, include/linux/time32.h, include/linux/time.h, ...):
>> arch/riscv/include/asm/timex.h:25:16: sparse: sparse: cast removes address space '__iomem' of expression
>> arch/riscv/include/asm/timex.h:25:16: 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:25:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:25:16: sparse:     got unsigned int [usertype] *
>> arch/riscv/include/asm/timex.h:25:16: 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:25:16: sparse:     expected void const volatile [noderef] __iomem *addr
   arch/riscv/include/asm/timex.h:25:16: sparse:     got unsigned int [usertype] *
   fs/ext4/mballoc.c:1217:9: sparse: sparse: context imbalance in 'ext4_mb_init_cache' - different lock contexts for basic block
   fs/ext4/mballoc.c:2127:5: sparse: sparse: context imbalance in 'ext4_mb_try_best_found' - different lock contexts for basic block
   fs/ext4/mballoc.c:2155:5: sparse: sparse: context imbalance in 'ext4_mb_find_by_goal' - different lock contexts for basic block
   fs/ext4/mballoc.c:2448:12: sparse: sparse: context imbalance in 'ext4_mb_good_group_nolock' - wrong count at exit
   fs/ext4/mballoc.c:2670:58: sparse: sparse: context imbalance in 'ext4_mb_regular_allocator' - different lock contexts for basic block
   fs/ext4/mballoc.c:2942:13: sparse: sparse: context imbalance in 'ext4_mb_seq_structs_summary_start' - wrong count at exit
   fs/ext4/mballoc.c:3322:17: sparse: sparse: context imbalance in 'ext4_discard_work' - different lock contexts for basic block
   fs/ext4/mballoc.c:3525:17: sparse: sparse: context imbalance in 'ext4_mb_release' - different lock contexts for basic block
   fs/ext4/mballoc.c:3647:26: sparse: sparse: context imbalance in 'ext4_free_data_in_buddy' - wrong count at exit
   fs/ext4/mballoc.c:3852:15: sparse: sparse: context imbalance in 'ext4_mb_mark_diskspace_used' - different lock contexts for basic block
   fs/ext4/mballoc.c:3964:9: sparse: sparse: context imbalance in 'ext4_mb_mark_bb' - different lock contexts for basic block
   fs/ext4/mballoc.c:4240:13: sparse: sparse: context imbalance in 'ext4_discard_allocated_blocks' - different lock contexts for basic block
   fs/ext4/mballoc.c:4542:13: sparse: sparse: context imbalance in 'ext4_mb_put_pa' - different lock contexts for basic block
   fs/ext4/mballoc.c:4924:9: sparse: sparse: context imbalance in 'ext4_mb_discard_group_preallocations' - different lock contexts for basic block
   fs/ext4/mballoc.c:5017:9: sparse: sparse: context imbalance in 'ext4_discard_preallocations' - different lock contexts for basic block
   fs/ext4/mballoc.c:5084:9: sparse: sparse: context imbalance in 'ext4_mb_show_ac' - different lock contexts for basic block
   fs/ext4/mballoc.c:5313:9: sparse: sparse: context imbalance in 'ext4_mb_discard_lg_preallocations' - different lock contexts for basic block
   fs/ext4/mballoc.c:5084:9: sparse: sparse: context imbalance in 'ext4_mb_new_blocks' - different lock contexts for basic block
   fs/ext4/mballoc.c:5910:9: sparse: sparse: context imbalance in 'ext4_mb_clear_bb' - different lock contexts for basic block
   fs/ext4/mballoc.c:6309:15: sparse: sparse: context imbalance in 'ext4_group_add_blocks' - different lock contexts for basic block
   fs/ext4/mballoc.c:6325:12: sparse: sparse: context imbalance in 'ext4_trim_extent' - wrong count at exit
   fs/ext4/mballoc.c:6400:9: sparse: sparse: context imbalance in 'ext4_try_to_trim_range' - different lock contexts for basic block
   fs/ext4/mballoc.c:6418:1: sparse: sparse: context imbalance in 'ext4_trim_all_free' - different lock contexts for basic block
   fs/ext4/mballoc.c:6560:1: sparse: sparse: context imbalance in 'ext4_mballoc_query_range' - different lock contexts for basic block

vim +/__iomem +25 arch/riscv/include/asm/timex.h

d5be89a8d118a8 Palmer Dabbelt 2020-09-14  16  
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  17  #ifdef CONFIG_64BIT
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  18  static inline cycles_t get_cycles(void)
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  19  {
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  20  	return readq_relaxed(clint_time_val);
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  21  }
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  22  #else /* !CONFIG_64BIT */
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  23  static inline u32 get_cycles(void)
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  24  {
d5be89a8d118a8 Palmer Dabbelt 2020-09-14 @25  	return readl_relaxed(((u32 *)clint_time_val));
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  26  }
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  27  #define get_cycles get_cycles
d5be89a8d118a8 Palmer Dabbelt 2020-09-14  28  

:::::: The code at line 25 was first introduced by commit
:::::: d5be89a8d118a8e8d09cd74a921a808f17fbdd09 RISC-V: Resurrect the MMIO timer implementation for M-mode systems

:::::: TO: Palmer Dabbelt <palmerdabbelt@google.com>
:::::: CC: Palmer Dabbelt <palmerdabbelt@google.com>

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