--- zzzz-none-000/linux-4.1.38/scripts/Makefile.modinst	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/scripts/Makefile.modinst	2020-11-25 10:06:48.000000000 +0000
@@ -29,7 +29,11 @@
 INSTALL_MOD_DIR ?= extra
 ext-mod-dir = $(INSTALL_MOD_DIR)$(subst $(patsubst %/,%,$(KBUILD_EXTMOD)),,$(@D))
 
+ifdef BCM_KF # defined(CONFIG_BCM_KF_MISC_MAKEFILE)
+modinst_dir = $(if $(filter ../% /%,$@),extra/,kernel/$(@D))
+else # BCM_KF #CONFIG_BCM_KF_MODINST_DIR
 modinst_dir = $(if $(KBUILD_EXTMOD),$(ext-mod-dir),kernel/$(@D))
+endif # BCM_KF #CONFIG_BCM_KF_MISC_MAKEFILE
 
 $(modules):
 	$(call cmd,modules_install,$(MODLIB)/$(modinst_dir))