[Buildroot] [PATCH] linux/linux.mk: forcibly (re)enable Make jobserver

Commit 0b9efc991f8a («linux: use BR2_MAKE», 2023-04-10) replaced $(MAKE)
with $(BR2_MAKE) in a number of recipes. As a consequence, the child make
is unable to discover the job server, and we get a warning such as

> warning: jobserver unavailable: using -j1. Add `+' to parent make rule.

https://www.gnu.org/software/make/manual/html_node/Error-Messages.html
https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html

Inform the parent Make, by prefixing the recipe with "+", that $(BR2_MAKE)
can deal with the job server.

Cc: Arnout Vandecappelle <[email protected]>
Cc: Oleg Lyovin <[email protected]>
Cc: [email protected]
Signed-off-by: Laszlo Ersek <[email protected]>
---

Notes:
    Commit 0b9efc991f8a replaces multiple instances of $(MAKE) with
    $(BR2_MAKE); I'm only prefixing the one recipe with "+" that seems to
    cause the most noticeable slowdown for me (by missing out on a parallel
    kernel build).

 linux/linux.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux/linux.mk b/linux/linux.mk
index e790daff6608..80581081a7eb 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -696,7 +696,7 @@ linux-rebuild-with-initramfs: rootfs-cpio
 linux-rebuild-with-initramfs:
 	@$(call MESSAGE,"Rebuilding kernel with initramfs")
 	# Build the kernel.
-	$(LINUX_MAKE_ENV) $(BR2_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))
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