linux-kernel - [PATCH 5.1 074/121] kbuild: tar-pkg: enable communication with jobserver

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Date:   Mon, 24 Jun 2019 17:56:46 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Trevor Bourget <tgb.kernel@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 074/121] kbuild: tar-pkg: enable communication with jobserver

[ Upstream commit a6e0487709ded7cd1ba0c390d9771e5cb76a8453 ]

The buildtar script might want to invoke a make, so tell the parent
make to pass the jobserver token pipe to the subcommand by prefixing
the command with a +.

This addresses the issue seen here:

  /bin/sh ../scripts/package/buildtar tar-pkg
  make[3]: warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.

See https://www.gnu.org/software/make/manual/html_node/Job-Slots.html
for more information.

Signed-off-by: Trevor Bourget <tgb.kernel@...il.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/package/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/package/Makefile b/scripts/package/Makefile
index 2c6de21e5152..fd854439de0f 100644
--- a/scripts/package/Makefile
+++ b/scripts/package/Makefile
@@ -103,7 +103,7 @@ clean-dirs += $(objtree)/snap/
 # ---------------------------------------------------------------------------
 tar%pkg: FORCE
 	$(MAKE) -f $(srctree)/Makefile
-	$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
+	+$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
 
 clean-dirs += $(objtree)/tar-install/
 
-- 
2.20.1