linux-kernel - [PATCH 07/15] kbuild: build all prerequisite of headers

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Date:   Tue,  4 Jun 2019 19:14:01 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Jani Nikula <jani.nikula@...el.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/15] kbuild: build all prerequisite of headers_install simultaneously

Currently, scripts/unifdef is compiled after scripts_basic,
uapi-asm-generic, archheaders, and archscripts.

The proper dependency is just scripts_basic. There is no problem
to compile scripts/unifdef and other headers at the same time.

Split scripts_unifdef out in order to allow more parallel building.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index e998c40c94b4..f9c206eb3583 100644
--- a/Makefile
+++ b/Makefile
@@ -1181,8 +1181,7 @@ export INSTALL_HDR_PATH = $(objtree)/usr
 PHONY += archheaders archscripts
 
 PHONY += __headers
-__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
-	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
+__headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
 
 PHONY += headers_install
 headers_install: __headers
@@ -1204,6 +1203,10 @@ ifdef CONFIG_HEADERS_CHECK
 all: headers_check
 endif
 
+PHONY += scripts_unifdef
+scripts_unifdef: scripts_basic
+	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
+
 # ---------------------------------------------------------------------------
 # Kernel selftest
 
-- 
2.17.1