[arnd-playground:set_fs 2/11] mm/maccess.c:37:17: sparse: sparse: cast removes address space '__user' of expression
From: kernel test robot
Date: Sat Feb 12 2022 - 23:44:25 EST
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-lkp@xxxxxxxxx/config)
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/commit/?id=872ec1b8b0c531c0367aa6f365149bf70d3bcd30
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@xxxxxxxxx>
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@xxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
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