[leon-rdma:rxe-rust-v1 59/88] warning: casting to the same type is unnecessary (`usize` -> `usize`)

[leon-rdma:rxe-rust-v1 59/88] warning: casting to the same type is unnecessary (`usize` -> `usize`)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git rxe-rust-v1
head:   fe52737deab42b438e356282106b9418915da058
commit: ed890b3e682f3d63fa94f23c99b3adbf20c98ff5 [59/88] rust: rdma: Guard CPU access to on-demand user memory
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20261012/202610122328.VelgjrRL-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/20261012/202610122328.VelgjrRL-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/202610122328.VelgjrRL-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> warning: casting to the same type is unnecessary (`usize` -> `usize`)
   --> rust/kernel/rdma/odp.rs:25:22
   |
   25 | const VALID: usize = bindings::hmm_pfn_flags_HMM_PFN_VALID as usize;
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `bindings::hmm_pfn_flags_HMM_PFN_VALID`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#unnecessary_cast
   = note: `-W clippy::unnecessary-cast` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::unnecessary_cast)]`
--
>> warning: casting to the same type is unnecessary (`usize` -> `usize`)
   --> rust/kernel/rdma/odp.rs:26:22
   |
   26 | const WRITE: usize = bindings::hmm_pfn_flags_HMM_PFN_WRITE as usize;
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `bindings::hmm_pfn_flags_HMM_PFN_WRITE`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.96.0/index.html#unnecessary_cast

--
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https://github.com/intel/lkp-tests/wiki