--- zzzz-none-000/linux-3.10.107/tools/perf/util/PERF-VERSION-GEN	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/tools/perf/util/PERF-VERSION-GEN	2021-02-04 17:41:59.000000000 +0000
@@ -13,13 +13,25 @@
 # First check if there is a .git to get the version from git describe
 # otherwise try to get the version from the kernel Makefile
 #
-if test -d ../../.git -o -f ../../.git &&
-	VN=$(git tag 2>/dev/null | tail -1 | grep -E "v[0-9].[0-9]*")
+CID=
+TAG=
+if test -d ../../.git -o -f ../../.git
 then
-	VN=$(echo $VN"-g"$(git log -1 --abbrev=4 --pretty=format:"%h" HEAD))
-	VN=$(echo "$VN" | sed -e 's/-/./g');
-else
-	VN=$(MAKEFLAGS= make -sC ../.. kernelversion)
+	TAG=$(git describe --abbrev=0 --match "v[0-9].[0-9]*" 2>/dev/null )
+	CID=$(git log -1 --abbrev=4 --pretty=format:"%h" 2>/dev/null) && CID="-g$CID"
+elif test -f ../../PERF-VERSION-FILE
+then
+	TAG=$(cut -d' ' -f3 ../../PERF-VERSION-FILE | sed -e 's/\"//g')
+fi
+if test -z "$TAG"
+then
+	TAG=$(MAKEFLAGS= make -sC ../.. kernelversion)
+fi
+VN="$TAG$CID"
+if test -n "$CID"
+then
+	# format version string, strip trailing zero of sublevel:
+	VN=$(echo "$VN" | sed -e 's/-/./g;s/\([0-9]*[.][0-9]*\)[.]0/\1/')
 fi
 
 VN=$(expr "$VN" : v*'\(.*\)')
@@ -31,7 +43,7 @@
 	VC=unset
 fi
 test "$VN" = "$VC" || {
-	echo >&2 "PERF_VERSION = $VN"
+	echo >&2 "  PERF_VERSION = $VN"
 	echo "#define PERF_VERSION \"$VN\"" >$GVF
 }