The change allow to build external modules with nested makefiles. Current unofficial way(using "src" variable) allow to build external(out of tree) kernel module with separating source and build artifacts dirs but with nested makefiles it doesn't work properly. Build system trap to recursion inside makefiles, articafts output dir path grow with each iteration until exceed max path len and build failed This fix update "src" var during processing subdirs and resolve recursion issue Usage example: make -C KERNEL_SOURCE_TREE M=BUILD_OUT_DIR src=EXT_MOD_SRC_DIR modules Cc: Valerii Chernous <vchernou@xxxxxxxxx> Cc: xe-linux-external@xxxxxxxxx Signed-off-by: Valerii Chernous <vchernou@xxxxxxxxx> --- scripts/Makefile.build | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/Makefile.build b/scripts/Makefile.build index a293950e2e07..75ea9052ea4a 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -490,6 +490,7 @@ $(single-subdir-goals): $(single-subdirs) PHONY += $(subdir-ym) $(subdir-ym): $(Q)$(MAKE) $(build)=$@ \ + $(if $(findstring command line,$(origin src)),src=$(patsubst $(obj)/%,$(src)/%,$@)) \ need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \ need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \ $(filter $@/%, $(single-subdir-goals)) -- 2.35.6
