From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Wed, 16 Oct 2019 05:15:47 +0000 (+0900)
Subject: kbuild: make single target builds much faster
X-Git-Tag: Ubuntu-5.13.0-19.19~7158^2~43
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=2dffd23f81a365307c0edcf9cb40b6ddae2b481e;p=mirror_ubuntu-jammy-kernel.git

kbuild: make single target builds much faster

Since commit 394053f4a4b3 ("kbuild: make single targets work more
correctly"), building single targets is really slow.

Speed it up by not descending into unrelated directories.

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

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index dcbb0124dac4..7eabbb66a65c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -479,7 +479,10 @@ curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
 unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
 			$(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
 
-__build: $(curdir-single) $(subdir-ym)
+single-subdirs := $(foreach d, $(subdir-ym), \
+			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
+
+__build: $(curdir-single) $(single-subdirs)
 ifneq ($(unknown-single),)
 	$(Q)$(MAKE) -f /dev/null $(unknown-single)
 endif