[PATCH v2 2/2] rust: Add pr_*_once macros

[FUJITA Tomonori <fujita.tomonori@gmail.com>]

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

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---
 rust/kernel/print.rs | 70 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/rust/kernel/print.rs b/rust/kernel/print.rs
index 2d743d78d220..d66fd8e90be2 100644
--- a/rust/kernel/print.rs
+++ b/rust/kernel/print.rs
@@ -423,3 +423,73 @@ 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.
+#[macro_export]
+macro_rules! pr_emerg_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_emerg!($($arg)*) }
+    )
+);
+
+/// Prints an alert-level message (level 1) only once.
+///
+/// Equivalent to the kernel's `pr_alert_once` macro.
+#[macro_export]
+macro_rules! pr_alert_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_alert!($($arg)*) }
+    )
+);
+
+/// Prints a critical-level message (level 2) only once.
+///
+/// Equivalent to the kernel's `pr_crit_once` macro.
+#[macro_export]
+macro_rules! pr_crit_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_crit!($($arg)*) }
+    )
+);
+
+/// Prints an error-level message (level 3) only once.
+///
+/// Equivalent to the kernel's `pr_err_once` macro.
+#[macro_export]
+macro_rules! pr_err_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_err!($($arg)*) }
+    )
+);
+
+/// Prints a warning-level message (level 4) only once.
+///
+/// Equivalent to the kernel's `pr_warn_once` macro.
+#[macro_export]
+macro_rules! pr_warn_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_warn!($($arg)*) }
+    )
+);
+
+/// Prints a notice-level message (level 5) only once.
+///
+/// Equivalent to the kernel's `pr_notice_once` macro.
+#[macro_export]
+macro_rules! pr_notice_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_notice!($($arg)*) }
+    )
+);
+
+/// Prints an info-level message (level 6) only once.
+///
+/// Equivalent to the kernel's `pr_info_once` macro.
+#[macro_export]
+macro_rules! pr_info_once (
+    ($($arg:tt)*) => (
+        $crate::do_once_lite! { $crate::pr_info!($($arg)*) }
+    )
+);
-- 
2.43.0