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    Subject[RFC 4/5] rust: sync: impl Debug for {Unique,}Arc
    Date
    This allows printing macros to print the data and the refcount nubmer
    of these struct for debugging purposes.

    Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
    ---
    rust/kernel/sync/arc.rs | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
    index 4d8de20c996f..f143d8305c36 100644
    --- a/rust/kernel/sync/arc.rs
    +++ b/rust/kernel/sync/arc.rs
    @@ -474,6 +474,7 @@ impl<T: ?Sized> Deref for ArcBorrow<'_, T> {
    ///
    /// # test().unwrap();
    /// ```
    +#[derive(Debug)]
    pub struct UniqueArc<T: ?Sized> {
    inner: Arc<T>,
    }
    @@ -545,3 +546,15 @@ impl<T: fmt::Display + ?Sized> fmt::Display for Arc<T> {
    fmt::Display::fmt(self.deref(), f)
    }
    }
    +
    +impl<T: fmt::Debug + ?Sized> fmt::Debug for Arc<T> {
    + /// Formats debug output for [`Arc`].
    + ///
    + /// Refcount is also printed for debugging purpose.
    + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    + f.debug_struct("Arc")
    + .field("refcount", &self.get_inner().count())
    + .field("data", &self.deref())
    + .finish()
    + }
    +}
    --
    2.39.1
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