linux: use BR2_MAKE

Since kernel version 6.2, the minimum GNU Make version is 3.82 [1]. We
have an optional host-make 4.0 minimum dependency, so we can use it as
is. It's a bit unfortunate that we have to apply this even to older
kernel versions, but make itself builds fairly fast compared to the
kernel.

Use BR2_MAKE and BR2_MAKE1 for linux, and depend on
BR2_MAKE_HOST_DEPENDENCY. In addition, we need to set LINUX_MAKE to
BR2_MAKE for use in the kconfig infrastructure.

Signed-off-by: Oleg Lyovin <ovlevin@sberdevices.ru>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

linux/linux.mk

@@ -70,7 +70,10 @@ LINUX_MAKE_ENV = \
 	BR_BINARIES_DIR=$(BINARIES_DIR)
 
 LINUX_INSTALL_IMAGES = YES
-LINUX_DEPENDENCIES = host-kmod
+LINUX_DEPENDENCIES = \
+	host-kmod \
+	$(BR2_MAKE_HOST_DEPENDENCY)
+LINUX_MAKE = $(BR2_MAKE)
 
 # The kernel CONFIG_EXTRA_FIRMWARE feature requires firmware files at build
 # time. Make sure they are available before the kernel builds.
@@ -183,7 +186,7 @@ endif
 # Get the real Linux version, which tells us where kernel modules are
 # going to be installed in the target filesystem.
 # Filter out 'w' from MAKEFLAGS, to workaround a bug in make 4.1 (#13141)
-LINUX_VERSION_PROBED = `MAKEFLAGS='$(filter-out w,$(MAKEFLAGS))' $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
+LINUX_VERSION_PROBED = `MAKEFLAGS='$(filter-out w,$(MAKEFLAGS))' $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) --no-print-directory -s kernelrelease 2>/dev/null`
 
 LINUX_DTS_NAME += $(call qstrip,$(BR2_LINUX_KERNEL_INTREE_DTS_NAME))
 
@@ -433,7 +436,7 @@ LINUX_DEPENDENCIES += host-bison host-flex
 
 ifeq ($(BR2_LINUX_KERNEL_DTB_IS_SELF_BUILT),)
 define LINUX_BUILD_DTB
-	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
+	$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_DTBS)
 endef
 ifeq ($(BR2_LINUX_KERNEL_APPENDED_DTB),)
 define LINUX_INSTALL_DTB
@@ -481,7 +484,7 @@ endif
 # Compilation. We make sure the kernel gets rebuilt when the
 # configuration has changed. We call the 'all' and
 # '$(LINUX_TARGET_NAME)' targets separately because calling them in
-# the same $(MAKE) invocation has shown to cause parallel build
+# the same $(BR2_MAKE) invocation has shown to cause parallel build
 # issues.
 # The call to disable gcc-plugins is a stop-gap measure:
 #   http://lists.busybox.net/pipermail/buildroot/2020-May/282727.html
@@ -490,8 +493,8 @@ define LINUX_BUILD_CMDS
 	$(foreach dts,$(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_DTS_PATH)), \
 		cp -f $(dts) $(LINUX_ARCH_PATH)/boot/dts/
 	)
-	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
-	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
+	$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) all
+	$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(@D) $(LINUX_TARGET_NAME)
 	$(LINUX_BUILD_DTB)
 	$(LINUX_APPEND_DTB)
 endef
@@ -540,7 +543,7 @@ define LINUX_INSTALL_TARGET_CMDS
 	# Install modules and remove symbolic links pointing to build
 	# directories, not relevant on the target
 	@if grep -q "CONFIG_MODULES=y" $(@D)/.config; then \
-		$(LINUX_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
+		$(LINUX_MAKE_ENV) $(BR2_MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) modules_install; \
 		rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/build ; \
 		rm -f $(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED)/source ; \
 	fi
@@ -639,7 +642,7 @@ linux-rebuild-with-initramfs: rootfs-cpio
 linux-rebuild-with-initramfs:
 	@$(call MESSAGE,"Rebuilding kernel with initramfs")
 	# Build the kernel.
-	$(LINUX_MAKE_ENV) $(MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
+	$(LINUX_MAKE_ENV) $(BR2_MAKE) $(LINUX_MAKE_FLAGS) -C $(LINUX_DIR) $(LINUX_TARGET_NAME)
 	$(LINUX_APPEND_DTB)
 	# Copy the kernel image(s) to its(their) final destination
 	$(call LINUX_INSTALL_IMAGE,$(BINARIES_DIR))