linux-kernel - drivers/clocksource/timer-clint.c:82:24: sparse: sparse: cast removes address space '_

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Date:   Fri, 16 Dec 2022 05:50:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Aurelien Jarno <aurelien@...el32.net>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: drivers/clocksource/timer-clint.c:82:24: sparse: sparse: cast
 removes address space '__iomem' of expression

Hi Aurelien,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   041fae9c105ae342a4245cf1e0dc56a23fbb9d3c
commit: 6df2a016c0c8a3d0933ef33dd192ea6606b115e3 riscv: fix build with binutils 2.38
date:   10 months ago
config: riscv-randconfig-s031-20221215
compiler: riscv32-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6df2a016c0c8a3d0933ef33dd192ea6606b115e3
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 6df2a016c0c8a3d0933ef33dd192ea6606b115e3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash drivers/clocksource/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

sparse warnings: (new ones prefixed by >>)
>> drivers/clocksource/timer-clint.c:82:24: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/clocksource/timer-clint.c:82:24: 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:82:24: sparse:     expected void const volatile [noderef] __iomem *addr
   drivers/clocksource/timer-clint.c:82:24: sparse:     got unsigned int [usertype] *
   drivers/clocksource/timer-clint.c:80:22: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/clocksource/timer-clint.c:80:22: 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:80:22: sparse:     expected void const volatile [noderef] __iomem *addr
   drivers/clocksource/timer-clint.c:80:22: sparse:     got unsigned int [usertype] *
   drivers/clocksource/timer-clint.c:237:36: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void * @@     got struct clock_event_device [noderef] __percpu * @@
   drivers/clocksource/timer-clint.c:237:36: sparse:     expected void *
   drivers/clocksource/timer-clint.c:237:36: sparse:     got struct clock_event_device [noderef] __percpu *

vim +/__iomem +82 drivers/clocksource/timer-clint.c

2ac6795fcc085e Anup Patel 2020-08-17  68  
2ac6795fcc085e Anup Patel 2020-08-17  69  #ifdef CONFIG_64BIT
2ac6795fcc085e Anup Patel 2020-08-17  70  static u64 notrace clint_get_cycles64(void)
2ac6795fcc085e Anup Patel 2020-08-17  71  {
2ac6795fcc085e Anup Patel 2020-08-17  72  	return clint_get_cycles();
2ac6795fcc085e Anup Patel 2020-08-17  73  }
2ac6795fcc085e Anup Patel 2020-08-17  74  #else /* CONFIG_64BIT */
2ac6795fcc085e Anup Patel 2020-08-17  75  static u64 notrace clint_get_cycles64(void)
2ac6795fcc085e Anup Patel 2020-08-17  76  {
2ac6795fcc085e Anup Patel 2020-08-17  77  	u32 hi, lo;
2ac6795fcc085e Anup Patel 2020-08-17  78  
2ac6795fcc085e Anup Patel 2020-08-17  79  	do {
2ac6795fcc085e Anup Patel 2020-08-17  80  		hi = clint_get_cycles_hi();
2ac6795fcc085e Anup Patel 2020-08-17  81  		lo = clint_get_cycles();
2ac6795fcc085e Anup Patel 2020-08-17 @82  	} while (hi != clint_get_cycles_hi());
2ac6795fcc085e Anup Patel 2020-08-17  83  
2ac6795fcc085e Anup Patel 2020-08-17  84  	return ((u64)hi << 32) | lo;
2ac6795fcc085e Anup Patel 2020-08-17  85  }
2ac6795fcc085e Anup Patel 2020-08-17  86  #endif /* CONFIG_64BIT */
2ac6795fcc085e Anup Patel 2020-08-17  87  

:::::: The code at line 82 was first introduced by commit
:::::: 2ac6795fcc085e8d03649f1bbd0d70aaff612cad clocksource/drivers: Add CLINT timer driver

:::::: TO: Anup Patel <anup.patel@....com>
:::::: CC: Palmer Dabbelt <palmerdabbelt@...gle.com>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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