Test for probestack linking errors

drivers/char/rust_example.rs

@@ -2,6 +2,7 @@
 
 #![no_std]
 #![feature(allocator_api, global_asm)]
+#![feature(test)]
 
 use alloc::boxed::Box;
 use core::pin::Pin;
@@ -52,6 +53,13 @@ impl KernelModule for RustExample {
         println!("  my_bool:  {}", my_bool.read());
         println!("  my_i32:   {}", my_i32.read());
 
+        // Including this large variable on the stack will trigger
+        // stack probing on the supported archs.
+        // This will verify that stack probing does not lead to
+        // any errors if we need to link `__rust_probestack`.
+        let x: [u64; 1028] = core::hint::black_box([5; 1028]);
+        println!("Large array has length: {}", x.len());
+
         Ok(RustExample {
             message: "on the heap!".to_owned(),
             _dev: miscdev::Registration::new_pinned::<RustFile>(cstr!("rust_miscdev"), None)?,

drivers/char/rust_example_2.rs

@@ -2,6 +2,7 @@
 
 #![no_std]
 #![feature(allocator_api, global_asm)]
+#![feature(test)]
 
 use kernel::prelude::*;
 
@@ -36,6 +37,14 @@ impl KernelModule for RustExample2 {
         println!("[2] Parameters:");
         println!("[2]   my_bool:  {}", my_bool.read());
         println!("[2]   my_i32:   {}", my_i32.read());
+
+        // Including this large variable on the stack will trigger
+        // stack probing on the supported archs.
+        // This will verify that stack probing does not lead to
+        // any errors if we need to link `__rust_probestack`.
+        let x: [u64; 1028] = core::hint::black_box([5; 1028]);
+        println!("Large array has length: {}", x.len());
+
         Ok(RustExample2 {
             message: "on the heap!".to_owned(),
         })

drivers/char/rust_example_3.rs

@@ -2,6 +2,7 @@
 
 #![no_std]
 #![feature(allocator_api, global_asm)]
+#![feature(test)]
 
 use kernel::prelude::*;
 
@@ -36,6 +37,14 @@ impl KernelModule for RustExample3 {
         println!("[3] Parameters:");
         println!("[3]   my_bool:  {}", my_bool.read());
         println!("[3]   my_i32:   {}", my_i32.read());
+
+        // Including this large variable on the stack will trigger
+        // stack probing on the supported archs.
+        // This will verify that stack probing does not lead to
+        // any errors if we need to link `__rust_probestack`.
+        let x: [u64; 1028] = core::hint::black_box([5; 1028]);
+        println!("Large array has length: {}", x.len());
+
         Ok(RustExample3 {
             message: "on the heap!".to_owned(),
         })

drivers/char/rust_example_4.rs

@@ -2,6 +2,7 @@
 
 #![no_std]
 #![feature(allocator_api, global_asm)]
+#![feature(test)]
 
 use kernel::prelude::*;
 
@@ -36,6 +37,14 @@ impl KernelModule for RustExample4 {
         println!("[4] Parameters:");
         println!("[4]   my_bool:  {}", my_bool.read());
         println!("[4]   my_i32:   {}", my_i32.read());
+
+        // Including this large variable on the stack will trigger
+        // stack probing on the supported archs.
+        // This will verify that stack probing does not lead to
+        // any errors if we need to link `__rust_probestack`.
+        let x: [u64; 1028] = core::hint::black_box([5; 1028]);
+        println!("Large array has length: {}", x.len());
+
         Ok(RustExample4 {
             message: "on the heap!".to_owned(),
         })