Fix the requirements for reliable stack traces

Before this commit, it was assumed that the kernel stack traces were
reliable in the following cases:

* CONFIG_FRAME_POINTER=y (most of the Linux distros)
* CONFIG_STACK_UNWIND=y (old SuSE distros)

The current distros with the kernels 4.19+ usually have either
CONFIG_UNWINDER_FRAME_POINTER=y (Ubuntu, etc.) or
CONFIG_UNWINDER_ORC=y (RHEL 8, SuSE, Debian, ...), the stack traces
should be reliable in both cases.

Take this into account and do not fail the build of KEDR.

#49

Signed-off-by: Evgenii Shatokhin <[email protected]>

Author: Evgenii Shatokhin

sources/cmake/kmodule_sources/check_stack_trace/module.c

@@ -10,9 +10,12 @@ MODULE_LICENSE("GPL");
  * CONFIG_STACKTRACE). If stack traces are reliable but save_stack_trace()
  * cannot be used, there are alternatives but this is another story. */
 
-#if !defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_UNWIND_INFO) && \
-    !defined(CONFIG_STACK_UNWIND)
-#error Stack trace data can be unreliable on this system.
+#if !defined(CONFIG_FRAME_POINTER) && \
+    !defined(CONFIG_UNWIND_INFO) && \
+    !defined(CONFIG_STACK_UNWIND) && \
+    !defined(CONFIG_UNWINDER_FRAME_POINTER) && \
+    !defined(CONFIG_UNWINDER_ORC)
+#error Stack traces might be unreliable.
 #endif
 
 #if !defined(CONFIG_STACKTRACE)

sources/cmake/modules/kmodule.cmake

@@ -206,7 +206,7 @@ macro(check_stack_trace)
 		message (FATAL_ERROR
 		"It looks like reliable stack traces cannot be obtained on this system. "
 		"Please rebuild the kernel with CONFIG_STACKTRACE=y and "
-		"CONFIG_FRAME_POINTER=y or CONFIG_STACK_UNWIND=y (if available) "
+		"CONFIG_UNWINDER_FRAME_POINTER=y or CONFIG_UNWINDER_ORC=y "
 		"and then reconfigure and rebuild KEDR.")
 	endif (NOT STACK_TRACE_RELIABLE)
 endmacro(check_stack_trace)