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systemtap: Cross compilation fix

This is a cross compilation fix. It allows systemtap to find
the kernel map file in the right place, i.e. in the kernel build tree.
Without this fix it takes a map file from the build host, if available.

Upstream-Status: Pending

Signed-off-by: Mikhail Durnev <mikhail_durnev@mentor.com>

Index: git/session.cxx
===================================================================
--- git.orig/session.cxx
+++ git/session.cxx
@@ -1634,7 +1634,7 @@ systemtap_session::parse_kernel_function
 	clog << _F("Kernel symbol table %s unavailable, (%s)",
 		   system_map_path.c_str(), strerror(errno)) << endl;
 
-      system_map_path = "/boot/System.map-" + kernel_release;
+      system_map_path = kernel_build_tree + "/System.map-" + kernel_release;
       system_map.clear();
       system_map.open(system_map_path.c_str(), ifstream::in);
       if (! system_map.is_open())