From: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> commit ce99d0bf312daf0178e640da9e3c93b773a67e7d upstream. Currently LDFLAGS is not cleared, so same flags are accumulated in LDFLAGS when the top Makefile is recursively invoked. I found unneeded rebuild for ARCH=arm64 when CONFIG_TRIM_UNUSED_KSYMS is enabled. If include/generated/autoksyms.h is updated, the top Makefile is recursively invoked, then arch/arm64/Makefile adds one more '-maarch64linux'. Due to the command line change, modules are rebuilt needlessly. Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Acked-by: Nicolas Pitre <nico@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Makefile | 1 + 1 file changed, 1 insertion(+) --- a/Makefile +++ b/Makefile @@ -395,6 +395,7 @@ KBUILD_CFLAGS_KERNEL := KBUILD_AFLAGS_MODULE := -DMODULE KBUILD_CFLAGS_MODULE := -DMODULE KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds +LDFLAGS := GCC_PLUGINS_CFLAGS := CLANG_FLAGS :=
