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authorBoqun Feng <boqun.feng@gmail.com>2023-02-07 10:52:16 -0800
committerMiguel Ojeda <ojeda@kernel.org>2023-04-10 05:05:43 +0200
commitf431c5c581fa176f608ba3fdebb3c1051bad5774 (patch)
tree05bf3b7e7e5c343c883c4f5077cddcf3bd3a9568 /samples
parent00140a8308367208d56e93cf08fa1636202a0dc7 (diff)
downloadlwn-f431c5c581fa176f608ba3fdebb3c1051bad5774.tar.gz
lwn-f431c5c581fa176f608ba3fdebb3c1051bad5774.zip
samples: rust: print: Add sample code for Arc printing
This both demonstrates the usage of different print format in Rust and serves as a selftest for the `Display` and `Debug` implementation of `Arc` and its friends. Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Reviewed-by: Finn Behrens <fin@nyantec.com> Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com> Reviewed-by: Gary Guo <gary@garyguo.net> Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com> Link: https://lore.kernel.org/r/20230207185216.1314638-3-boqun.feng@gmail.com [ Applied suggestions and reworded for fixing title typos. ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'samples')
-rw-r--r--samples/rust/rust_print.rs26
1 files changed, 26 insertions, 0 deletions
diff --git a/samples/rust/rust_print.rs b/samples/rust/rust_print.rs
index 8b39d9cef6d1..67ed8ebf8e8e 100644
--- a/samples/rust/rust_print.rs
+++ b/samples/rust/rust_print.rs
@@ -15,6 +15,30 @@ module! {
struct RustPrint;
+fn arc_print() -> Result {
+ use kernel::sync::*;
+
+ let a = Arc::try_new(1)?;
+ let b = UniqueArc::try_new("hello, world")?;
+
+ // Prints the value of data in `a`.
+ pr_info!("{}", a);
+
+ // Uses ":?" to print debug fmt of `b`.
+ pr_info!("{:?}", b);
+
+ let a: Arc<&str> = b.into();
+ let c = a.clone();
+
+ // Uses `dbg` to print, will move `c` (for temporary debugging purposes).
+ dbg!(c);
+
+ // Pretty-prints the debug formatting with lower-case hexadecimal integers.
+ pr_info!("{:#x?}", a);
+
+ Ok(())
+}
+
impl kernel::Module for RustPrint {
fn init(_module: &'static ThisModule) -> Result<Self> {
pr_info!("Rust printing macros sample (init)\n");
@@ -43,6 +67,8 @@ impl kernel::Module for RustPrint {
pr_cont!(" is {}", "continued");
pr_cont!(" with {}\n", "args");
+ arc_print()?;
+
Ok(RustPrint)
}
}