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2025-10-22rust: support formatting of foreign typesTamir Duberstein
Introduce a `fmt!` macro which wraps all arguments in `kernel::fmt::Adapter` and a `kernel::fmt::Display` trait. This enables formatting of foreign types (like `core::ffi::CStr`) that do not implement `core::fmt::Display` due to concerns around lossy conversions which do not apply in the kernel. Suggested-by: Alice Ryhl <aliceryhl@google.com> Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Custom.20formatting/with/516476467 Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Benno Lossin <lossin@kernel.org> Signed-off-by: Tamir Duberstein <tamird@gmail.com> Link: https://patch.msgid.link/20251018-cstr-core-v18-15-9378a54385f8@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2025-07-21rust: kernel: add `fmt` moduleTamir Duberstein
`kernel::fmt` is a facade over `core::fmt` that can be used downstream, allowing future changes to the formatting machinery to be contained within the kernel crate without downstream code needing to be modified. Signed-off-by: Tamir Duberstein <tamird@gmail.com> Reviewed-by: Benno Lossin <lossin@kernel.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20250704-core-cstr-prepare-v1-2-a91524037783@gmail.com Signed-off-by: Miguel Ojeda <ojeda@kernel.org>