Re: [PATCH v4] rust: kernel: introduce `unsafe_precondition_assert!` macro

[Alice Ryhl <aliceryhl@google.com>]

On Sat, Aug 09, 2025 at 12:47:49AM +0530, Ritvik Gupta wrote:
> Introduce a new `safety` module containing `unsafe_precondition_assert!`
> macro. It is a wrapper around `debug_assert!`, intended for validating
> pre-conditions of unsafe function.
> 
> When `CONFIG_RUST_DEBUG_ASSERTIONS` flag is enabled, this macro performs
> runtime checks to ensure that the preconditions for unsafe function hold.
> Otherwise, the macro is a no-op.
> 
> Suggested-by: Miguel Ojeda <ojeda@kernel.org>
> Link: https://github.com/Rust-for-Linux/linux/issues/1162
> Link: https://rust-for-linux.zulipchat.com/#narrow/channel/291566-Library/topic/.60unsafe_precondition_assert.60.20macro/with/528457452
> Signed-off-by: Ritvik Gupta <ritvikfoss@gmail.com>

> +    ($cond:expr, $($arg:tt)+) => {
> +        $crate::unsafe_precondition_assert!(@inner $cond, ::core::format_args!($($arg)+))

Tamir, taking your fmt series into account, what's the correct
replacement for ::core::format_args! here?

Alice