--- zzzz-none-000/linux-4.1.52/tools/perf/util/PERF-VERSION-GEN	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/tools/perf/util/PERF-VERSION-GEN	2022-03-02 11:37:14.000000000 +0000
@@ -25,7 +25,7 @@
 fi
 if test -z "$TAG"
 then
-	TAG=$(MAKEFLAGS= make -sC ../.. kernelversion)
+	TAG=$(MAKEFLAGS= make -sC ../.. kernelversion | grep "^[0-9]")
 fi
 VN="$TAG$CID"
 if test -n "$CID"