diff options
author | Kalle Valo <kvalo@kernel.org> | 2023-01-17 13:36:25 +0200 |
---|---|---|
committer | Kalle Valo <kvalo@kernel.org> | 2023-01-17 13:36:25 +0200 |
commit | d0e99511834b6828c960e978d9a8cb6e5731250d (patch) | |
tree | e7b062c1f9d28a55083477a1462286a7923a57fd /rust/build_error.rs | |
parent | de7d0ff301fccc75281d7d8eb98c4a47faacf32d (diff) | |
parent | 80f8a66dede0a4b4e9e846765a97809c6fe49ce5 (diff) | |
download | linux-d0e99511834b6828c960e978d9a8cb6e5731250d.tar.gz linux-d0e99511834b6828c960e978d9a8cb6e5731250d.tar.bz2 linux-d0e99511834b6828c960e978d9a8cb6e5731250d.zip |
Merge wireless into wireless-next
Due to the two cherry picked commits from wireless to wireless-next we have
several conflicts in mt76. To avoid any bugs with conflicts merge wireless into
wireless-next.
96f134dc1964 wifi: mt76: handle possible mt76_rx_token_consume failures
fe13dad8992b wifi: mt76: dma: do not increment queue head if mt76_dma_add_buf fails
Diffstat (limited to 'rust/build_error.rs')
-rw-r--r-- | rust/build_error.rs | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/rust/build_error.rs b/rust/build_error.rs new file mode 100644 index 000000000000..fa24eeef9929 --- /dev/null +++ b/rust/build_error.rs @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Build-time error. +//! +//! This crate provides a [const function][const-functions] `build_error`, which will panic in +//! compile-time if executed in [const context][const-context], and will cause a build error +//! if not executed at compile time and the optimizer does not optimise away the call. +//! +//! It is used by `build_assert!` in the kernel crate, allowing checking of +//! conditions that could be checked statically, but could not be enforced in +//! Rust yet (e.g. perform some checks in [const functions][const-functions], but those +//! functions could still be called in the runtime). +//! +//! For details on constant evaluation in Rust, please see the [Reference][const-eval]. +//! +//! [const-eval]: https://doc.rust-lang.org/reference/const_eval.html +//! [const-functions]: https://doc.rust-lang.org/reference/const_eval.html#const-functions +//! [const-context]: https://doc.rust-lang.org/reference/const_eval.html#const-context + +#![no_std] + +/// Panics if executed in [const context][const-context], or triggers a build error if not. +/// +/// [const-context]: https://doc.rust-lang.org/reference/const_eval.html#const-context +#[inline(never)] +#[cold] +#[export_name = "rust_build_error"] +#[track_caller] +pub const fn build_error(msg: &'static str) -> ! { + panic!("{}", msg); +} |