linux-kernel - rust/helpers/io.c:12:10: error: passing 'volatile void *' to parameter of type 'void *' discards qualifiers

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Message-ID: <202502231029.mBK5dkZJ-lkp@intel.com>
Date: Sun, 23 Feb 2025 10:50:28 +0800
From: kernel test robot <lkp@...el.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Alice Ryhl <aliceryhl@...gle.com>,
	Daniel Almeida <daniel.almeida@...labora.com>
Subject: rust/helpers/io.c:12:10: error: passing 'volatile void *' to
 parameter of type 'void *' discards qualifiers

Hi Danilo,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5cf80612d3f72c46ad53ef5042b4c609c393122f
commit: ce30d94e6855a4f6dc687f658e63c225fcc1d690 rust: add `io::{Io, IoRaw}` base types
date:   9 weeks ago
config: um-randconfig-r113-20250223 (https://download.01.org/0day-ci/archive/20250223/202502231029.mBK5dkZJ-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 204dcafec0ecf0db81d420d2de57b02ada6b09ec)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250223/202502231029.mBK5dkZJ-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502231029.mBK5dkZJ-lkp@intel.com/

All errors (new ones prefixed by >>):

   ***
   *** Rust bindings generator 'bindgen' < 0.69.5 together with libclang >= 19.1
   *** may not work due to a bug (https://github.com/rust-lang/rust-bindgen/pull/2824),
   *** unless patched (like Debian's).
   ***   Your bindgen version:  0.65.1
   ***   Your libclang version: 21.0.0
   ***
   ***
   *** Please see Documentation/rust/quick-start.rst for details
   *** on how to set up the Rust support.
   ***
   In file included from rust/helpers/helpers.c:10:
   In file included from rust/helpers/blk.c:3:
   In file included from include/linux/blk-mq.h:5:
   In file included from include/linux/blkdev.h:9:
   In file included from include/linux/blk_types.h:10:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/um/include/asm/cacheflush.h:4:
   In file included from arch/um/include/asm/tlbflush.h:9:
   In file included from include/linux/mm.h:2223:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from rust/helpers/helpers.c:17:
>> rust/helpers/io.c:12:10: error: passing 'volatile void *' to parameter of type 'void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
      12 |         iounmap(addr);
         |                 ^~~~
   arch/um/include/asm/io.h:19:42: note: passing argument to parameter 'addr' here
      19 | static inline void iounmap(void __iomem *addr)
         |                                          ^
   1 warning and 1 error generated.
   make[3]: *** [scripts/Makefile.build:194: rust/helpers/helpers.o] Error 1
   clang diag: include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>> rust/helpers/io.c:12:10: 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
   clang diag: include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
   make[3]: *** [rust/Makefile:330: rust/bindings/bindings_helpers_generated.rs] Error 101
   make[3]: *** Deleting file 'rust/bindings/bindings_helpers_generated.rs'
   clang diag: include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
   make[3]: Target 'rust/' not remade because of errors.
   make[2]: *** [Makefile:1269: prepare] Error 2
   make[1]: *** [Makefile:251: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:251: __sub-make] Error 2
   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		iounmap(addr);
    13	}
    14	

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