--- zzzz-none-000/linux-4.9.276/scripts/Kbuild.include	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/scripts/Kbuild.include	2023-04-05 08:19:02.000000000 +0000
@@ -54,6 +54,7 @@
 # - stdin is piped in from the first prerequisite ($<) so one has
 #   to specify a valid file as first prerequisite (often the kbuild file)
 define filechk
+	$(check-FORCE)
 	$(Q)set -e;				\
 	$(kecho) '  CHK     $@';		\
 	mkdir -p $(dir $@);			\
@@ -258,19 +259,28 @@
 # (needed for the shell)
 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
 
-# Find any prerequisites that is newer than target or that does not exist.
+# Find any prerequisites that are newer than target or that do not exist.
+# (This is not true for now; $? should contain any non-existent prerequisites,
+# but it does not work as expected when .SECONDARY is present. This seems a bug
+# of GNU Make.)
 # PHONY targets skipped in both cases.
-any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
+newer-prereqs = $(filter-out $(PHONY),$?)
+
+# It is a typical mistake to forget the FORCE prerequisite. Check it here so
+# no more breakage will slip in.
+check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing))
+
+if-changed-cond = $(newer-prereqs)$(arg-check)$(check-FORCE)
 
 # Execute command if command has changed or prerequisite(s) are updated.
 #
-if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
+if_changed = $(if $(if-changed-cond),                                        \
 	@set -e;                                                             \
 	$(echo-cmd) $(cmd_$(1));                                             \
 	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
 
 # Execute the command and also postprocess generated .d dependencies file.
-if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ),                  \
+if_changed_dep = $(if $(if-changed-cond),                                    \
 	@set -e;                                                             \
 	$(cmd_and_fixdep), @:)
 
@@ -312,7 +322,7 @@
 # Usage: $(call if_changed_rule,foo)
 # Will check if $(cmd_foo) or any of the prerequisites changed,
 # and if so will execute $(rule_foo).
-if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
+if_changed_rule = $(if $(if-changed-cond),                                   \
 	@set -e;                                                             \
 	$(rule_$(1)), @:)
 
@@ -339,7 +349,7 @@
 why =                                                                        \
     $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
         $(if $(wildcard $@),                                                 \
-            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
+            $(if $(newer-prereqs),- due to: $(newer-prereqs),                \
                 $(if $(arg-check),                                           \
                     $(if $(cmd_$@),- due to command line change,             \
                         $(if $(filter $@, $(targets)),                       \