test/linux: Test if kernel logs only known warn and errors

We know that out kernel logs some warnings and errors on startup.
These are accepted.
With this test we make sure that the kernel only logs these messages and
nothing new.

Author: SmithChart

tests/test_linux_pstore.py

@@ -1,6 +1,32 @@
+import re
+
+
 def test_pstore_fs(shell):
     """
     Test if the pstore filesystem exists.
     """
 
     shell.run_check("test -d /sys/fs/pstore")
+
+
+def test_kernel_messages(shell, check):
+    """
+    Test if the kernel only logs messages that we expect.
+    """
+
+    expected = [
+        re.compile(r"^\[\s*\d+\.\d+\] spi_stm32 44009000\.spi: failed to request (tx|rx) dma channel"),
+        re.compile(r"^\[\s*\d+\.\d+\] clk: failed to reparent ethck_k to pll4_p: -22"),
+        re.compile(r"^\[\s*\d+\.\d+\] stm32-dwmac 5800a000\.ethernet switch: Adding VLAN ID 0 is not supported"),
+    ]
+
+    messages = shell.run_check("dmesg -l warn -l err -l crit -l alert -l emerg -k")
+
+    # Check if we do not have more messages than expected
+    for message in messages:
+        for e in expected:
+            if e.match(message):
+                break
+        else:
+            with check:
+                raise AssertionError(f"Kernel warned '{message}', but we did not expect this.")