Fix warnings in tests and make them errors (fishinabarrel#56)

Author: alex

tests/run_tests.py

@@ -32,6 +32,7 @@ def main():
             environ=dict(
                 os.environ,
                 RUST_TARGET_PATH=os.path.join(BASE_DIR, os.path.pardir),
+                RUSTFLAGS="-Dwarnings",
                 CARGO_TARGET_DIR=os.path.relpath(
                     os.path.join(BASE_DIR, "target"),
                     os.path.join(BASE_DIR, path)
@@ -57,9 +58,10 @@ def main():
         run(
             "rustc",
             "--test",
+            "-Dwarnings",
             "--out-dir", os.path.join(BASE_DIR, path),
             os.path.join(BASE_DIR, path, "tests.rs"),
-            "--extern", "kernel_module_tests=libtestlib.rlib"
+            "--extern", "kernel_module_tests=libtestlib.rlib",
         )
         # TODO: qemu
         run(

tests/sysctl/src/lib.rs

@@ -9,15 +9,25 @@ use linux_kernel_module::sysctl::Sysctl;
 use linux_kernel_module::Mode;
 
 struct SysctlTestModule {
-    sysctl_a: Sysctl<AtomicBool>,
-    sysctl_b: Sysctl<AtomicBool>,
+    _sysctl_a: Sysctl<AtomicBool>,
+    _sysctl_b: Sysctl<AtomicBool>,
 }
 
 impl linux_kernel_module::KernelModule for SysctlTestModule {
     fn init() -> linux_kernel_module::KernelResult<Self> {
         Ok(SysctlTestModule {
-            sysctl_a: Sysctl::register("rust/sysctl-tests\x00", "a\x00", AtomicBool::new(false), Mode::from_int(0o666))?,
-            sysctl_b: Sysctl::register("rust/sysctl-tests\x00", "b\x00", AtomicBool::new(false), Mode::from_int(0o666))?,
+            _sysctl_a: Sysctl::register(
+                "rust/sysctl-tests\x00",
+                "a\x00",
+                AtomicBool::new(false),
+                Mode::from_int(0o666),
+            )?,
+            _sysctl_b: Sysctl::register(
+                "rust/sysctl-tests\x00",
+                "b\x00",
+                AtomicBool::new(false),
+                Mode::from_int(0o666),
+            )?,
         })
     }
 }