| // SPDX-License-Identifier: GPL-2.0 |
| |
| #include <linux/build_bug.h> |
| |
| /* |
| * `bindgen` binds the C `size_t` type as the Rust `usize` type, so we can |
| * use it in contexts where Rust expects a `usize` like slice (array) indices. |
| * `usize` is defined to be the same as C's `uintptr_t` type (can hold any |
| * pointer) but not necessarily the same as `size_t` (can hold the size of any |
| * single object). Most modern platforms use the same concrete integer type for |
| * both of them, but in case we find ourselves on a platform where |
| * that's not true, fail early instead of risking ABI or |
| * integer-overflow issues. |
| * |
| * If your platform fails this assertion, it means that you are in |
| * danger of integer-overflow bugs (even if you attempt to add |
| * `--no-size_t-is-usize`). It may be easiest to change the kernel ABI on |
| * your platform such that `size_t` matches `uintptr_t` (i.e., to increase |
| * `size_t`, because `uintptr_t` has to be at least as big as `size_t`). |
| */ |
| static_assert( |
| sizeof(size_t) == sizeof(uintptr_t) && |
| __alignof__(size_t) == __alignof__(uintptr_t), |
| "Rust code expects C `size_t` to match Rust `usize`" |
| ); |
