From 2dfec887c0fd7d25d26b2ba7e60479208f9b6fb8 Mon Sep 17 00:00:00 2001
From: Masahiro Yamada <masahiroy@kernel.org>
Date: Wed, 23 Aug 2023 20:50:45 +0900
Subject: [PATCH] kbuild: reduce the number of mkdir calls during
 modules_install

Calling 'mkdir' for every module results in redundant syscalls.

Use $(sort ...) to drop the duplicated directories.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
---
 scripts/Makefile.modinst | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 7a64ece9b8260..96fea7c5dbe18 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -9,6 +9,8 @@ __modinst:
 include include/config/auto.conf
 include $(srctree)/scripts/Kbuild.include
 
+install-y :=
+
 modules := $(call read-file, $(MODORDER))
 
 ifeq ($(KBUILD_EXTMOD),)
@@ -27,6 +29,7 @@ suffix-$(CONFIG_MODULE_COMPRESS_XZ)	:= .xz
 suffix-$(CONFIG_MODULE_COMPRESS_ZSTD)	:= .zst
 
 modules := $(patsubst $(extmod_prefix)%.o, $(dst)/%.ko$(suffix-y), $(modules))
+install-$(CONFIG_MODULES) += $(modules)
 
 __modinst: $(modules)
 	@:
@@ -35,7 +38,7 @@ __modinst: $(modules)
 # Installation
 #
 quiet_cmd_install = INSTALL $@
-      cmd_install = mkdir -p $(dir $@); cp $< $@
+      cmd_install = cp $< $@
 
 # Strip
 #
@@ -81,6 +84,9 @@ endif
 
 ifeq ($(modules_sign_only),)
 
+# Create necessary directories
+$(shell mkdir -p $(sort $(dir $(install-y))))
+
 $(dst)/%.ko: $(extmod_prefix)%.ko FORCE
 	$(call cmd,install)
 	$(call cmd,strip)
-- 
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