[thomas-weissschuh:b4/rust-kunit-assertion 6/10] Diff in rust/kernel/sync/atomic/predefine.rs:305:

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

Hi Thomas,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/thomas.weissschuh/linux.git b4/rust-kunit-assertion
head:   fbe73450cefcca4ff86e4228d44e205327d15c7f
commit: 0c121ebc74a143b8096ec774fcd95f2c438f886e [6/10] prep: atomic
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20261002/202610020520.Xb6jANEo-lkp@intel.com/config)
compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261002/202610020520.Xb6jANEo-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/202610020520.Xb6jANEo-lkp@intel.com/

All errors (new ones prefixed by >>):

   PATH=/opt/cross/clang-22/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   INFO PATH=/opt/cross/rustc-1.96.0-bindgen-0.72.1/cargo/bin:/opt/cross/clang-22/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   /usr/bin/timeout -k 100 12h /usr/bin/make KCFLAGS=\ -fno-crash-diagnostics\ -Wno-error=return-type\ -Wreturn-type\ -funsigned-char\ -Wundef\ -falign-functions=64 W=1 --keep-going LLVM=1 -j32 -C source O=/kbuild/obj/consumer/x86_64-rhel-9.4-rust ARCH=x86_64 SHELL=/bin/bash rustfmtcheck 
   make: Entering directory '/kbuild/src'
   make[1]: Entering directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
>> Diff in rust/kernel/sync/atomic/predefine.rs:305:
            let x = Atomic::new(&raw const v);
    
            assert_eq!(x.load(Acquire), &raw const v);
   -        assert_matches!(
   -            x.cmpxchg(&raw const u, &raw const u, Relaxed),
   -            Err(_)
   -        );
   -        assert_matches!(
   -            x.cmpxchg(&raw const v, &raw const u, Relaxed),
   -            Ok(_)
   -        );
   +        assert_matches!(x.cmpxchg(&raw const u, &raw const u, Relaxed), Err(_));
   +        assert_matches!(x.cmpxchg(&raw const v, &raw const u, Relaxed), Ok(_));
            assert_eq!(x.load(Relaxed), &raw const u);
        }
    
>> Diff in rust/kernel/sync/atomic/predefine.rs:305:
            let x = Atomic::new(&raw const v);
    
            assert_eq!(x.load(Acquire), &raw const v);
   -        assert_matches!(
   -            x.cmpxchg(&raw const u, &raw const u, Relaxed),
   -            Err(_)
   -        );
   -        assert_matches!(
   -            x.cmpxchg(&raw const v, &raw const u, Relaxed),
   -            Ok(_)
   -        );
   +        assert_matches!(x.cmpxchg(&raw const u, &raw const u, Relaxed), Err(_));
   +        assert_matches!(x.cmpxchg(&raw const v, &raw const u, Relaxed), Ok(_));
            assert_eq!(x.load(Relaxed), &raw const u);
        }
    
>> Diff in rust/kernel/sync/atomic/predefine.rs:305:
            let x = Atomic::new(&raw const v);
    
            assert_eq!(x.load(Acquire), &raw const v);
   -        assert_matches!(
   -            x.cmpxchg(&raw const u, &raw const u, Relaxed),
   -            Err(_)
   -        );
   -        assert_matches!(
   -            x.cmpxchg(&raw const v, &raw const u, Relaxed),
   -            Ok(_)
   -        );
   +        assert_matches!(x.cmpxchg(&raw const u, &raw const u, Relaxed), Err(_));
   +        assert_matches!(x.cmpxchg(&raw const v, &raw const u, Relaxed), Ok(_));
            assert_eq!(x.load(Relaxed), &raw const u);
        }
    
>> Diff in rust/kernel/sync/atomic/predefine.rs:305:
            let x = Atomic::new(&raw const v);
    
            assert_eq!(x.load(Acquire), &raw const v);
   -        assert_matches!(
   -            x.cmpxchg(&raw const u, &raw const u, Relaxed),
   -            Err(_)
   -        );
   -        assert_matches!(
   -            x.cmpxchg(&raw const v, &raw const u, Relaxed),
   -            Ok(_)
   -        );
   +        assert_matches!(x.cmpxchg(&raw const u, &raw const u, Relaxed), Err(_));
   +        assert_matches!(x.cmpxchg(&raw const v, &raw const u, Relaxed), Ok(_));
            assert_eq!(x.load(Relaxed), &raw const u);
        }
    
   make[2]: *** [Makefile:2038: rustfmt] Error 123
   make[2]: Target 'rustfmtcheck' not remade because of errors.
   make[1]: Leaving directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'rustfmtcheck' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'rustfmtcheck' not remade because of errors.
   make: Leaving directory '/kbuild/src'

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