linux-kernel - [PATCH] rust: add this

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Message-Id: <20230131130841.318301-1-yakoyoku@gmail.com>
Date:   Tue, 31 Jan 2023 10:08:41 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Subject: [PATCH] rust: add this_module macro

Adds a Rust equivalent to the handy THIS_MODULE macro from C.

Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
---
 rust/kernel/lib.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index e0b0e953907d..afb6b0390426 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -80,6 +80,18 @@ impl ThisModule {
     }
 }
 
+/// Returns the current module.
+#[macro_export]
+macro_rules! this_module {
+    () => {
+        if cfg!(MODULE) {
+            Some(unsafe { $crate::ThisModule::from_ptr(&mut $crate::bindings::__this_module) })
+        } else {
+            None
+        }
+    };
+}
+
 #[cfg(not(any(testlib, test)))]
 #[panic_handler]
 fn panic(info: &core::panic::PanicInfo<'_>) -> ! {
-- 
2.39.1