[norov:bitmap_param 20/21] error[E0308]: mismatched types

Hi Yury,

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

tree:   https://github.com/norov/linux bitmap_param
head:   2ebf9d0d17a23d79cfabad902c9bf18f47c2adc9
commit: a13ae5f39450bd51f39aa7519689c3372e8225f0 [20/21] bitmap: use unsigned long for bit indices and sizes
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260722/[email protected]/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/20260722/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> error[E0308]: mismatched types
   --> rust/kernel/bitmap.rs:260:52
   |
   260 |         let ptr = unsafe { bindings::bitmap_zalloc(nbits_u32, flags.as_raw()) };
   |                            ----------------------- ^^^^^^^^^ expected `usize`, found `u32`
   |                            |
   |                            arguments to this function are incorrect
   |
   note: function defined here
   --> rust/bindings/bindings_generated.rs:24157:12
   |
   24157 |     pub fn bitmap_zalloc(nbits: ffi::c_ulong, flags: gfp_t) -> *mut ffi::c_ulong;
   |            ^^^^^^^^^^^^^
   help: you can convert a `u32` to a `usize` and panic if the converted value doesn't fit
   |
   260 |         let ptr = unsafe { bindings::bitmap_zalloc(nbits_u32.try_into().unwrap(), flags.as_raw()) };
   |                                                             ++++++++++++++++++++

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