|  | .. SPDX-License-Identifier: GPL-2.0 | 
|  |  | 
|  | Arch Support | 
|  | ============ | 
|  |  | 
|  | Currently, the Rust compiler (``rustc``) uses LLVM for code generation, | 
|  | which limits the supported architectures that can be targeted. In addition, | 
|  | support for building the kernel with LLVM/Clang varies (please see | 
|  | Documentation/kbuild/llvm.rst). This support is needed for ``bindgen`` | 
|  | which uses ``libclang``. | 
|  |  | 
|  | Below is a general summary of architectures that currently work. Level of | 
|  | support corresponds to ``S`` values in the ``MAINTAINERS`` file. | 
|  |  | 
|  | =============  ================  ============================================== | 
|  | Architecture   Level of support  Constraints | 
|  | =============  ================  ============================================== | 
|  | ``arm64``      Maintained        Little Endian only. | 
|  | ``loongarch``  Maintained        - | 
|  | ``um``         Maintained        ``x86_64`` only. | 
|  | ``x86``        Maintained        ``x86_64`` only. | 
|  | =============  ================  ============================================== | 
|  |  |