From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Wed, 5 Dec 2018 07:38:35 +0000 (+0900)
Subject: kbuild: exploit parallel building for CONFIG_HEADERS_CHECK
X-Git-Tag: for-linus-20190104~40^2~20
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=257edce66d31a345dff8ca9f1fd30c46e0f14058;p=linux-2.6-block.git

kbuild: exploit parallel building for CONFIG_HEADERS_CHECK

When CONFIG_HEADERS_CHECK is enabled, the headers_check is executed
as a serialized task in the vmlinux recipe.

Make it independent of vmlinux so that parallel building can process
the headers_check and other build targets simultaneously.

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

diff --git a/Makefile b/Makefile
index d4ac3cb9256c..00630cf04d84 100644
--- a/Makefile
+++ b/Makefile
@@ -1035,9 +1035,6 @@ cmd_link-vmlinux =                                                 \
 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
-ifdef CONFIG_HEADERS_CHECK
-	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
-endif
 ifdef CONFIG_GDB_SCRIPTS
 	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
 endif
@@ -1208,6 +1205,10 @@ headers_check: headers_install
 	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
 	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
 
+ifdef CONFIG_HEADERS_CHECK
+all: headers_check
+endif
+
 # ---------------------------------------------------------------------------
 # Kernel selftest