From 48cdec07e5f87ed7f80ec3810c497d76b8d4be40 Mon Sep 17 00:00:00 2001
From: Mauro Rossi <issor.oruam@gmail.com>
Date: Sat, 9 Jun 2018 00:17:15 +0100
Subject: [PATCH] kernel.mk: build with -j option based on processor cores

submake call builds kernel using only one job,
j option is used with number of processors cores retrieved by $(shell) call

v2: use $(nproc) and add -l to limit the number of jobs based on the load
    average (cwhuang)
---
 build/tasks/kernel.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index da84163..2062922 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -31,7 +31,7 @@ else
 CROSS_COMPILE ?= $(abspath $(TARGET_TOOLS_PREFIX))
 endif
 KBUILD_OUTPUT := $(abspath $(TARGET_OUT_INTERMEDIATES)/kernel)
-mk_kernel := + $(hide) $(MAKE) -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1)
+mk_kernel := + $(hide) $(MAKE) -j$$(nproc) -l$$(($$(nproc)+2)) -C $(KERNEL_DIR) O=$(KBUILD_OUTPUT) ARCH=$(TARGET_ARCH) CROSS_COMPILE="$(abspath $(CC_WRAPPER)) $(CROSS_COMPILE)" $(if $(SHOW_COMMANDS),V=1)
 
 KERNEL_CONFIG_FILE := $(if $(wildcard $(TARGET_KERNEL_CONFIG)),$(TARGET_KERNEL_CONFIG),$(KERNEL_DIR)/$(KERNEL_CONFIG_DIR)/$(TARGET_KERNEL_CONFIG))
 
-- 
2.11.0