[kbuild-all] [arnd-playground:set_fs 2/11] mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of expression

Sunday, 13 February 2022


tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git set_fs
head:   0a081326831928b0d739bce68b8c0f9138b9c8ba
commit: 872ec1b8b0c531c0367aa6f365149bf70d3bcd30 [2/11] sparc64: add
__{get,put}_kernel_nocheck()
config: sparc64-randconfig-s032-20220213
(https://download.01.org/0day-ci/archive/20220213/202202131259.S6ZP2d9J-lk...)
compiler: sparc64-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/commi...
        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 872ec1b8b0c531c0367aa6f365149bf70d3bcd30
        # 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=sparc64
SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;


sparse warnings: (new ones prefixed by >>)
...
> mm/maccess.c:37:17: sparse: sparse: cast removes address space
'__user' of expression
> mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of
expression
> mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of
expression
> mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of
expression    mm/maccess.c:39:17: sparse: sparse: cast removes address space
'__user' of expression
   mm/maccess.c:39:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:39:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:39:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:41:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:41:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:41:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:41:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:42:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:42:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:42:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:42:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:68:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:68:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:68:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:68:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:70:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:70:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:70:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:70:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:72:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:72:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:72:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:72:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:73:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:73:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:73:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:73:9: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:92:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:92:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:92:17: sparse: sparse: cast removes address space '__user' of
expression
   mm/maccess.c:92:17: sparse: sparse: cast removes address space '__user' of
expression

vim +/__user +37 mm/maccess.c

b58294ead14cde Christoph Hellwig 2020-06-08  16  
fe557319aa06c2 Christoph Hellwig 2020-06-17  17  #define
copy_from_kernel_nofault_loop(dst, src, len, type, err_label)	\
b58294ead14cde Christoph Hellwig 2020-06-08  18  	while (len >= sizeof(type)) {					\
b58294ead14cde Christoph Hellwig 2020-06-08  19  		__get_kernel_nofault(dst, src, type,
err_label);		\
b58294ead14cde Christoph Hellwig 2020-06-08  20  		dst += sizeof(type);					\
b58294ead14cde Christoph Hellwig 2020-06-08  21  		src += sizeof(type);					\
b58294ead14cde Christoph Hellwig 2020-06-08  22  		len -= sizeof(type);					\
b58294ead14cde Christoph Hellwig 2020-06-08  23  	}
b58294ead14cde Christoph Hellwig 2020-06-08  24  
fe557319aa06c2 Christoph Hellwig 2020-06-17  25  long copy_from_kernel_nofault(void *dst,
const void *src, size_t size)
b58294ead14cde Christoph Hellwig 2020-06-08  26  {
2423de2e6f4d86 Arnd Bergmann     2021-08-11  27  	unsigned long align = 0;
2423de2e6f4d86 Arnd Bergmann     2021-08-11  28  
2423de2e6f4d86 Arnd Bergmann     2021-08-11  29  	if
(!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS))
2423de2e6f4d86 Arnd Bergmann     2021-08-11  30  		align = (unsigned long)dst | (unsigned
long)src;
2423de2e6f4d86 Arnd Bergmann     2021-08-11  31  
fe557319aa06c2 Christoph Hellwig 2020-06-17  32  	if
(!copy_from_kernel_nofault_allowed(src, size))
2a71e81d321987 Christoph Hellwig 2020-06-08  33  		return -ERANGE;
b58294ead14cde Christoph Hellwig 2020-06-08  34  
b58294ead14cde Christoph Hellwig 2020-06-08  35  	pagefault_disable();
2423de2e6f4d86 Arnd Bergmann     2021-08-11  36  	if (!(align & 7))
fe557319aa06c2 Christoph Hellwig 2020-06-17 @37  		copy_from_kernel_nofault_loop(dst, src,
size, u64, Efault);
2423de2e6f4d86 Arnd Bergmann     2021-08-11  38  	if (!(align & 3))
fe557319aa06c2 Christoph Hellwig 2020-06-17  39  		copy_from_kernel_nofault_loop(dst, src,
size, u32, Efault);
2423de2e6f4d86 Arnd Bergmann     2021-08-11  40  	if (!(align & 1))
fe557319aa06c2 Christoph Hellwig 2020-06-17  41  		copy_from_kernel_nofault_loop(dst, src,
size, u16, Efault);
fe557319aa06c2 Christoph Hellwig 2020-06-17  42  	copy_from_kernel_nofault_loop(dst, src,
size, u8, Efault);
b58294ead14cde Christoph Hellwig 2020-06-08  43  	pagefault_enable();
b58294ead14cde Christoph Hellwig 2020-06-08  44  	return 0;
b58294ead14cde Christoph Hellwig 2020-06-08  45  Efault:
b58294ead14cde Christoph Hellwig 2020-06-08  46  	pagefault_enable();
b58294ead14cde Christoph Hellwig 2020-06-08  47  	return -EFAULT;
b58294ead14cde Christoph Hellwig 2020-06-08  48  }
fe557319aa06c2 Christoph Hellwig 2020-06-17  49 
EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);
b58294ead14cde Christoph Hellwig 2020-06-08  50  

:::::: The code at line 37 was first introduced by commit
:::::: fe557319aa06c23cffc9346000f119547e0f289a maccess: rename probe_kernel_{read,write}
to copy_{from,to}_kernel_nofault

:::::: TO: Christoph Hellwig <hch(a)lst.de&gt;
:::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt;

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

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[kbuild-all] [arnd-playground:set_fs 2/11] mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of expression