livepatch/klp-build: Fix inconsistent kernel version

If .config hasn't been synced with auto.conf, any recent changes to
CONFIG_LOCALVERSION* may not get reflected in the kernel version name.

Use "make syncconfig" to force them to sync, and "make -s kernelrelease"
to get the version instead of having to construct it manually.

Fixes: 24ebfcd ("livepatch/klp-build: Introduce klp-build script for generating livepatch modules")
Closes: https://lore.kernel.org/[email protected]
Reported-by: Joe Lawrence <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Joe Lawrence <[email protected]>
Acked-by: Song Liu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Josh Poimboeuf <[email protected]>

Author: jpoimboe

scripts/livepatch/klp-build

@@ -285,15 +285,14 @@ set_module_name() {
 # application from appending it with '+' due to a dirty git working tree.
 set_kernelversion() {
 	local file="$SRC/scripts/setlocalversion"
-	local localversion
+	local kernelrelease
 
 	stash_file "$file"
 
-	localversion="$(cd "$SRC" && make --no-print-directory kernelversion)"
-	localversion="$(cd "$SRC" && KERNELVERSION="$localversion" ./scripts/setlocalversion)"
-	[[ -z "$localversion" ]] && die "setlocalversion failed"
+	kernelrelease="$(cd "$SRC" && make syncconfig &>/dev/null && make -s kernelrelease)"
+	[[ -z "$kernelrelease" ]] && die "failed to get kernel version"
 
-	sed -i "2i echo $localversion; exit 0" scripts/setlocalversion
+	sed -i "2i echo $kernelrelease; exit 0" scripts/setlocalversion
 }
 
 get_patch_files() {