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rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs

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This is useful when using types that may or may not be empty in generic
code relying on these traits. It is also safe because technically a
no-op.

Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Benno Lossin <lossin@kernel.org>
Link: https://patch.msgid.link/20251215-transmute_unit-v4-1-477d71ec7c23@nvidia.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Alexandre Courbot 2025-12-15 14:49:09 +09:00 • committed by Miguel Ojeda
parent 7f87c7a003
commit 209c70953a
1 changed files with 8 additions and 0 deletions
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8
rust/kernel/transmute.rs
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@ -170,6 +170,10 @@ macro_rules! impl_frombytes {
}
impl_frombytes! {
// SAFETY: Inhabited ZSTs only have one possible bit pattern, and these two have no invariant.
(),
{<T>} core::marker::PhantomData<T>,
// SAFETY: All bit patterns are acceptable values of the types below.
u8, u16, u32, u64, usize,
i8, i16, i32, i64, isize,
@ -230,6 +234,10 @@ macro_rules! impl_asbytes {
}
impl_asbytes! {
// SAFETY: Inhabited ZSTs only have one possible bit pattern, and these two have no invariant.
(),
{<T>} core::marker::PhantomData<T>,
// SAFETY: Instances of the following types have no uninitialized portions.
u8, u16, u32, u64, usize,
i8, i16, i32, i64, isize,