linux-kernel - [PATCH] kbuild: reuse vmlinux.o in vmlinux

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Message-Id: <20200521202716.193316-1-samitolvanen@google.com>
Date:   Thu, 21 May 2020 13:27:16 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Kees Cook <keescook@...omium.org>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH] kbuild: reuse vmlinux.o in vmlinux_link

Instead of linking all compilation units again each time vmlinux_link is
called, reuse vmlinux.o from modpost_link.

With x86_64 allyesconfig, vmlinux_link is called three times and reusing
vmlinux.o reduces the build time ~38 seconds on my system (59% reduction
in the time spent in vmlinux_link).

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 scripts/link-vmlinux.sh | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index d09ab4afbda4..c6cc4305950c 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -77,11 +77,8 @@ vmlinux_link()
 
 	if [ "${SRCARCH}" != "um" ]; then
 		objects="--whole-archive			\
-			${KBUILD_VMLINUX_OBJS}			\
+			vmlinux.o				\
 			--no-whole-archive			\
-			--start-group				\
-			${KBUILD_VMLINUX_LIBS}			\
-			--end-group				\
 			${@}"
 
 		${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux}	\

base-commit: b85051e755b0e9d6dd8f17ef1da083851b83287d
-- 
2.27.0.rc0.183.gde8f92d652-goog