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rust: debugfs: Implement Reader for Mutex<T> only when T is Unpin

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Since we are going to make `Mutex<T>` structurally pin the data (i.e.
`T`), therefore `.lock()` function only returns a `Guard` that can
dereference a mutable reference to `T` if only `T` is `Unpin`, therefore
restrict the impl `Reader` block of `Mutex<T>` to that.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20251022034237.70431-1-boqun.feng@gmail.com
This commit is contained in:
Boqun Feng
2025-10-21 23:42:37 -04:00
committed by Peter Zijlstra
parent 795aab353d
commit 37d0472c8a
1 changed files with 1 additions and 1 deletions
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2
rust/kernel/debugfs/traits.rs
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@@ -50,7 +50,7 @@ pub trait Reader {
fn read_from_slice(&self, reader: &mut UserSliceReader) -> Result;
}
impl<T: FromStr> Reader for Mutex<T> {
impl<T: FromStr + Unpin> Reader for Mutex<T> {
fn read_from_slice(&self, reader: &mut UserSliceReader) -> Result {
let mut buf = [0u8; 128];
if reader.len() > buf.len() {