[rust:staging/rust-pci 7/11] rust/helpers/io.c:12:17: error: passing 'volatile void *' to parameter of type 'void *' discards qualifiers

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/Rust-for-Linux/linux staging/rust-pci
head:   255cfcd4635cfca2732843557eace438918e6bec
commit: 685c3110658f6b63d93efbcab74763b7e486a333 [7/11] rust: add `io::{Io, IoRaw}` base types
config: um-randconfig-002-20241213 (https://download.01.org/0day-ci/archive/20241213/202412130534.HFYPTOBJ-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241213/202412130534.HFYPTOBJ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412130534.HFYPTOBJ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from rust/helpers/helpers.c:17:
>> rust/helpers/io.c:12:17: error: passing 'volatile void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           return iounmap(addr);
                          ^~~~
   arch/um/include/asm/io.h:19:42: note: passing argument to parameter 'addr' here
   static inline void iounmap(void __iomem *addr)
                                            ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:194: rust/helpers/helpers.o] Error 1 shuffle=3716242076
>> rust/helpers/io.c:12:17: error: passing 'volatile void *' to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
   arch/um/include/asm/io.h:19:42: note: passing argument to parameter 'addr' here
   make[3]: *** [rust/Makefile:317: rust/bindings/bindings_helpers_generated.rs] Error 101 shuffle=3716242076
   make[3]: *** Deleting file 'rust/bindings/bindings_helpers_generated.rs'
   make[3]: Target 'rust/' not remade because of errors.
   make[2]: *** [Makefile:1269: prepare] Error 2 shuffle=3716242076
   make[1]: *** [Makefile:251: __sub-make] Error 2 shuffle=3716242076
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:251: __sub-make] Error 2 shuffle=3716242076
   make: Target 'prepare' not remade because of errors.


vim +12 rust/helpers/io.c

     9	
    10	void rust_helper_iounmap(volatile void __iomem *addr)
    11	{
  > 12		return iounmap(addr);
    13	}
    14	

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