[linux-next:master 3345/4062] arch/um/kernel/skas/uaccess.c:358:9: sparse: sparse: incorrect type in argument 1 (different address spaces)

[linux-next:master 3345/4062] arch/um/kernel/skas/uaccess.c:358:9: sparse: sparse: incorrect type in argument 1 (different address spaces)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   c6d7e3b385f19869ab96e9404c92ff1abc34f2c8
commit: 20adc3e8f39ad4ce68795b6d3f9847f45ccd931a [3345/4062] highmem: Make kunmap_{local,atomic}() take pointers to const void
config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220617/202206170317.wxLpoEbx-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-30-g92122700-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=20adc3e8f39ad4ce68795b6d3f9847f45ccd931a
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 20adc3e8f39ad4ce68795b6d3f9847f45ccd931a
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash

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


sparse warnings: (new ones prefixed by >>)
   arch/um/kernel/skas/uaccess.c:273:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned int [noderef] [usertype] __user *uaddr @@     got unsigned int [usertype] * @@
   arch/um/kernel/skas/uaccess.c:273:15: sparse:     expected unsigned int [noderef] [usertype] __user *uaddr
   arch/um/kernel/skas/uaccess.c:273:15: sparse:     got unsigned int [usertype] *
   arch/um/kernel/skas/uaccess.c:348:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected unsigned int [noderef] [usertype] __user *uaddr @@     got void * @@
   arch/um/kernel/skas/uaccess.c:348:15: sparse:     expected unsigned int [noderef] [usertype] __user *uaddr
   arch/um/kernel/skas/uaccess.c:348:15: sparse:     got void *
   arch/um/kernel/skas/uaccess.c:353:15: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile *v @@     got unsigned int [noderef] [usertype] __user *__ai_ptr @@
   arch/um/kernel/skas/uaccess.c:353:15: sparse:     expected void const volatile *v
   arch/um/kernel/skas/uaccess.c:353:15: sparse:     got unsigned int [noderef] [usertype] __user *__ai_ptr
   arch/um/kernel/skas/uaccess.c:353:15: sparse: sparse: cast removes address space '__user' of expression
   arch/um/kernel/skas/uaccess.c:353:15: sparse: sparse: cast removes address space '__user' of expression
   arch/um/kernel/skas/uaccess.c:353:15: sparse: sparse: cast removes address space '__user' of expression
   arch/um/kernel/skas/uaccess.c:353:15: sparse: sparse: cast removes address space '__user' of expression
>> arch/um/kernel/skas/uaccess.c:358:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const *addr @@     got unsigned int [noderef] [usertype] __user *uaddr @@
   arch/um/kernel/skas/uaccess.c:358:9: sparse:     expected void const *addr
   arch/um/kernel/skas/uaccess.c:358:9: sparse:     got unsigned int [noderef] [usertype] __user *uaddr
   arch/um/kernel/skas/uaccess.c:274:19: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:280:18: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:283:18: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:286:18: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:289:18: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:292:18: sparse: sparse: dereference of noderef expression
   arch/um/kernel/skas/uaccess.c:351:18: sparse: sparse: dereference of noderef expression

vim +358 arch/um/kernel/skas/uaccess.c

dd3035a21ba7cc Anton Ivanov 2021-03-12  350  
dd3035a21ba7cc Anton Ivanov 2021-03-12  351  	*uval = *uaddr;
dd3035a21ba7cc Anton Ivanov 2021-03-12  352  
dd3035a21ba7cc Anton Ivanov 2021-03-12  353  	ret = cmpxchg(uaddr, oldval, newval);
dd3035a21ba7cc Anton Ivanov 2021-03-12  354  
dd3035a21ba7cc Anton Ivanov 2021-03-12  355  #ifdef CONFIG_64BIT
dd3035a21ba7cc Anton Ivanov 2021-03-12  356  	pagefault_enable();
dd3035a21ba7cc Anton Ivanov 2021-03-12  357  #else
dd3035a21ba7cc Anton Ivanov 2021-03-12 @358  	kunmap_atomic(uaddr);

:::::: The code at line 358 was first introduced by commit
:::::: dd3035a21ba7ccaa883d7107d357ad06320d78fc um: add a UML specific futex implementation

:::::: TO: Anton Ivanov <anton.ivanov@cambridgegreys.com>
:::::: CC: Richard Weinberger <richard@nod.at>

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