linux-kernel - [PATCH] kbuild: revive parallel execution for .tmp

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Date:   Tue, 15 Nov 2022 02:46:17 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kbuild: revive parallel execution for .tmp_initcalls.lds rule

Prior to commit 5d45950dfbb1 ("kbuild: move vmlinux.o link to
scripts/Makefile.vmlinux_o"), jobserver-exec was invoked from the shell
script, link-vmlinux.sh. It can get access to the jobserver because
Makefile adds '+' prefix, as in:

    +$(call if_changed_dep,link_vmlinux)

Since 5d45950dfbb1, jobserver-exec is invoked from Makefile, but the
'+' prefix is missing, hence jobserver-exec has no access to the
jobserver.

Fixes: 5d45950dfbb1 ("kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_o")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/Makefile.vmlinux_o | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 0edfdb40364b..ae52d3b3f063 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -19,7 +19,7 @@ quiet_cmd_gen_initcalls_lds = GEN     $@
 
 .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
 		vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
-	$(call if_changed,gen_initcalls_lds)
+	+$(call if_changed,gen_initcalls_lds)
 
 targets := .tmp_initcalls.lds
 
-- 
2.34.1