[ndctl PATCH] test/common: document magic number CXL_TEST_QOS_CLASS=42

[marc.herbert@linux.intel.com]

From: Marc Herbert <marc.herbert@linux.intel.com>

This magic number must match kernel code. Make that corresponding kernel
code much less time-consuming to find.

Additionally, that same one-line reference indirectly documents the
minimum kernel version required by the test(s) using this value (only
cxl-qos-class.sh at this time)

Signed-off-by: Marc Herbert <marc.herbert@linux.intel.com>
---
 test/common | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/common b/test/common
index 2d076402ef7c..1ab62be6994f 100644
--- a/test/common
+++ b/test/common
@@ -155,4 +155,5 @@ check_dmesg()
 }
 
 # CXL COMMON
+# Test constant defined in kernel commit v6.8-rc2-9-g117132edc690
 CXL_TEST_QOS_CLASS=42
-- 
2.50.1