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Date:   Tue, 10 Aug 2021 19:29:31 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, John S Gruber <>,
        Masahiro Yamada <>,
        Sasha Levin <>
Subject: [PATCH 5.13 063/175] kbuild: cancel sub_make_done for the install target to fix DKMS

From: Masahiro Yamada <>

[ Upstream commit 14ccc638b02f9ec500c17d9e39efe979145a4b61 ]

Since commit bcf637f54f6d ("kbuild: parse C= and M= before changing the
working directory"), external module builds invoked by DKMS fail because
M= option is not parsed.

I wanted to add 'unset sub_make_done' in but similar scripts,
arch/*/boot/, are duplicated, so I set sub_make_done empty in
the top Makefile.

Fixes: bcf637f54f6d ("kbuild: parse C= and M= before changing the working directory")
Reported-by: John S Gruber <>
Signed-off-by: Masahiro Yamada <>
Tested-by: John S Gruber <>
Signed-off-by: Sasha Levin <>
 Makefile | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Makefile b/Makefile
index 9d810e13a83f..218f44d7fc80 100644
--- a/Makefile
+++ b/Makefile
@@ -1366,6 +1366,15 @@ scripts_unifdef: scripts_basic
 	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
 # ---------------------------------------------------------------------------
+# Install
+# Many distributions have the custom install script, /sbin/installkernel.
+# If DKMS is installed, 'make install' will eventually recuses back
+# to the this Makefile to build and install external modules.
+# Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
+install: sub_make_done :=
 # Kernel selftest
 PHONY += kselftest

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