[PATCH v4 2/3] rust: print: Add pr_*_once macros

[Jens Korinth via B4 Relay]

From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>

Add Rust version of pr_[emerg|alert|crit|err|warn|notic|info]_once
functions, which print a message only once.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>
Signed-off-by: Jens Korinth <jens.korinth@xxxxxxx>
---
 rust/kernel/print.rs | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)

diff --git a/rust/kernel/print.rs b/rust/kernel/print.rs
index a28077a7cb301193dcca293befb096b2dd153202..f354b32684a2b3c6c5d9aca6ef9f68e52c870bcf 100644
--- a/rust/kernel/print.rs
+++ b/rust/kernel/print.rs
@@ -414,3 +414,129 @@ macro_rules! pr_cont (
         $crate::print_macro!($crate::print::format_strings::CONT, true, $($arg)*)
     )
 );
+
+/// Prints an emergency-level message (level 0) only once.
+///
+/// Equivalent to the kernel's [`pr_emerg_once`] macro.
+///
+/// [`pr_emerg_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_emerg_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_emerg_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_emerg!($($arg)*))
+    )
+);
+
+/// Prints an alert-level message (level 1) only once.
+///
+/// Equivalent to the kernel's [`pr_alert_once`] macro.
+///
+/// [`pr_alert_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_alert_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_alert_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_alert!($($arg)*))
+    )
+);
+
+/// Prints a critical-level message (level 2) only once.
+///
+/// Equivalent to the kernel's [`pr_crit_once`] macro.
+///
+/// [`pr_crit_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_crit_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_crit_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_crit!($($arg)*))
+    )
+);
+
+/// Prints an error-level message (level 3) only once.
+///
+/// Equivalent to the kernel's [`pr_err_once`] macro.
+///
+/// # Examples
+///
+/// [`pr_err_once`]: srctree/include/linux/printk.h
+///
+/// ```
+/// kernel::pr_err_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_err_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_err!($($arg)*))
+    )
+);
+
+/// Prints a warning-level message (level 4) only once.
+///
+/// Equivalent to the kernel's [`pr_warn_once`] macro.
+///
+/// [`pr_warn_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_warn_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_warn_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_warn!($($arg)*))
+    )
+);
+
+/// Prints a notice-level message (level 5) only once.
+///
+/// Equivalent to the kernel's [`pr_notice_once`] macro.
+///
+/// [`pr_notice_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_notice_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_notice_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_notice!($($arg)*))
+    )
+);
+
+/// Prints an info-level message (level 6) only once.
+///
+/// Equivalent to the kernel's [`pr_info_once`] macro.
+///
+/// [`pr_info_once`]: srctree/include/linux/printk.h
+///
+/// # Examples
+///
+/// ```
+/// kernel::pr_info_once!("hello {}\n", "there");
+/// ```
+#[macro_export]
+macro_rules! pr_info_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite!($crate::pr_info!($($arg)*))
+    )
+);

-- 
2.47.0