[arnd-playground:set_fs 6/11] arch/riscv/kernel/perf_callchain.c:22:14: sparse: sparse: incorrect type in argument 1 (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git set_fs
head:   0a081326831928b0d739bce68b8c0f9138b9c8ba
commit: a954036380ae20dbfa0c203bf6cafb21d1f3cedd [6/11] uaccess: generalize access_ok()
config: riscv-randconfig-s032-20220213 (https://download.01.org/0day-ci/archive/20220213/202202130419.oJqXwirc-lkp@xxxxxxxxx/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
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-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commit/?id=a954036380ae20dbfa0c203bf6cafb21d1f3cedd
        git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground set_fs
        git checkout a954036380ae20dbfa0c203bf6cafb21d1f3cedd
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)
>> arch/riscv/kernel/perf_callchain.c:22:14: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const [noderef] __user *ptr @@     got unsigned long *user_frame_tail @@
   arch/riscv/kernel/perf_callchain.c:22:14: sparse:     expected void const [noderef] __user *ptr
   arch/riscv/kernel/perf_callchain.c:22:14: sparse:     got unsigned long *user_frame_tail
   arch/riscv/kernel/perf_callchain.c:24:49: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const [noderef] __user *from @@     got unsigned long *user_frame_tail @@
   arch/riscv/kernel/perf_callchain.c:24:49: sparse:     expected void const [noderef] __user *from
   arch/riscv/kernel/perf_callchain.c:24:49: sparse:     got unsigned long *user_frame_tail

vim +22 arch/riscv/kernel/perf_callchain.c

dbeb90b0c1eb86 Mao Han 2019-08-29   8  
dbeb90b0c1eb86 Mao Han 2019-08-29   9  /*
dbeb90b0c1eb86 Mao Han 2019-08-29  10   * Get the return address for a single stackframe and return a pointer to the
dbeb90b0c1eb86 Mao Han 2019-08-29  11   * next frame tail.
dbeb90b0c1eb86 Mao Han 2019-08-29  12   */
dbeb90b0c1eb86 Mao Han 2019-08-29  13  static unsigned long user_backtrace(struct perf_callchain_entry_ctx *entry,
dbeb90b0c1eb86 Mao Han 2019-08-29  14  				    unsigned long fp, unsigned long reg_ra)
dbeb90b0c1eb86 Mao Han 2019-08-29  15  {
dbeb90b0c1eb86 Mao Han 2019-08-29  16  	struct stackframe buftail;
dbeb90b0c1eb86 Mao Han 2019-08-29  17  	unsigned long ra = 0;
dbeb90b0c1eb86 Mao Han 2019-08-29  18  	unsigned long *user_frame_tail =
dbeb90b0c1eb86 Mao Han 2019-08-29  19  			(unsigned long *)(fp - sizeof(struct stackframe));
dbeb90b0c1eb86 Mao Han 2019-08-29  20  
dbeb90b0c1eb86 Mao Han 2019-08-29  21  	/* Check accessibility of one struct frame_tail beyond */
dbeb90b0c1eb86 Mao Han 2019-08-29 @22  	if (!access_ok(user_frame_tail, sizeof(buftail)))
dbeb90b0c1eb86 Mao Han 2019-08-29  23  		return 0;
dbeb90b0c1eb86 Mao Han 2019-08-29  24  	if (__copy_from_user_inatomic(&buftail, user_frame_tail,
dbeb90b0c1eb86 Mao Han 2019-08-29  25  				      sizeof(buftail)))
dbeb90b0c1eb86 Mao Han 2019-08-29  26  		return 0;
dbeb90b0c1eb86 Mao Han 2019-08-29  27  
dbeb90b0c1eb86 Mao Han 2019-08-29  28  	if (reg_ra != 0)
dbeb90b0c1eb86 Mao Han 2019-08-29  29  		ra = reg_ra;
dbeb90b0c1eb86 Mao Han 2019-08-29  30  	else
dbeb90b0c1eb86 Mao Han 2019-08-29  31  		ra = buftail.ra;
dbeb90b0c1eb86 Mao Han 2019-08-29  32  
dbeb90b0c1eb86 Mao Han 2019-08-29  33  	fp = buftail.fp;
dbeb90b0c1eb86 Mao Han 2019-08-29  34  	if (ra != 0)
dbeb90b0c1eb86 Mao Han 2019-08-29  35  		perf_callchain_store(entry, ra);
dbeb90b0c1eb86 Mao Han 2019-08-29  36  	else
dbeb90b0c1eb86 Mao Han 2019-08-29  37  		return 0;
dbeb90b0c1eb86 Mao Han 2019-08-29  38  
dbeb90b0c1eb86 Mao Han 2019-08-29  39  	return fp;
dbeb90b0c1eb86 Mao Han 2019-08-29  40  }
dbeb90b0c1eb86 Mao Han 2019-08-29  41  

:::::: The code at line 22 was first introduced by commit
:::::: dbeb90b0c1eb86a9b963b929d3c937afb7dadfa3 riscv: Add perf callchain support

:::::: TO: Mao Han <han_mao@xxxxxxxxx>
:::::: CC: Paul Walmsley <paul.walmsley@xxxxxxxxxx>

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