1 // SPDX-License-Identifier: GPL-2.0 2 3 //! Rust printing macros sample. 4 5 use kernel::pr_cont; 6 use kernel::prelude::*; 7 8 module! { 9 type: RustPrint, 10 name: "rust_print", 11 author: "Rust for Linux Contributors", 12 description: "Rust printing macros sample", 13 license: "GPL", 14 } 15 16 struct RustPrint; 17 18 fn arc_print() -> Result { 19 use kernel::sync::*; 20 21 let a = Arc::try_new(1)?; 22 let b = UniqueArc::try_new("hello, world")?; 23 24 // Prints the value of data in `a`. 25 pr_info!("{}", a); 26 27 // Uses ":?" to print debug fmt of `b`. 28 pr_info!("{:?}", b); 29 30 let a: Arc<&str> = b.into(); 31 let c = a.clone(); 32 33 // Uses `dbg` to print, will move `c` (for temporary debugging purposes). 34 dbg!(c); 35 36 // Pretty-prints the debug formatting with lower-case hexadecimal integers. 37 pr_info!("{:#x?}", a); 38 39 Ok(()) 40 } 41 42 impl kernel::Module for RustPrint { 43 fn init(_module: &'static ThisModule) -> Result<Self> { 44 pr_info!("Rust printing macros sample (init)\n"); 45 46 pr_emerg!("Emergency message (level 0) without args\n"); 47 pr_alert!("Alert message (level 1) without args\n"); 48 pr_crit!("Critical message (level 2) without args\n"); 49 pr_err!("Error message (level 3) without args\n"); 50 pr_warn!("Warning message (level 4) without args\n"); 51 pr_notice!("Notice message (level 5) without args\n"); 52 pr_info!("Info message (level 6) without args\n"); 53 54 pr_info!("A line that"); 55 pr_cont!(" is continued"); 56 pr_cont!(" without args\n"); 57 58 pr_emerg!("{} message (level {}) with args\n", "Emergency", 0); 59 pr_alert!("{} message (level {}) with args\n", "Alert", 1); 60 pr_crit!("{} message (level {}) with args\n", "Critical", 2); 61 pr_err!("{} message (level {}) with args\n", "Error", 3); 62 pr_warn!("{} message (level {}) with args\n", "Warning", 4); 63 pr_notice!("{} message (level {}) with args\n", "Notice", 5); 64 pr_info!("{} message (level {}) with args\n", "Info", 6); 65 66 pr_info!("A {} that", "line"); 67 pr_cont!(" is {}", "continued"); 68 pr_cont!(" with {}\n", "args"); 69 70 arc_print()?; 71 72 Ok(RustPrint) 73 } 74 } 75 76 impl Drop for RustPrint { 77 fn drop(&mut self) { 78 pr_info!("Rust printing macros sample (exit)\n"); 79 } 80 } 81