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[v9,04/16] kbuild: lto: limit inlining

Message ID 20201211184633.3213045-5-samitolvanen@google.com (mailing list archive)
State Not Applicable
Headers show
Series Add support for Clang LTO | expand

Commit Message

Sami Tolvanen Dec. 11, 2020, 6:46 p.m. UTC 
This change limits function inlining across translation unit boundaries
in order to reduce the binary size with LTO. The -import-instr-limit
flag defines a size limit, as the number of LLVM IR instructions, for
importing functions from other TUs, defaulting to 100.

Based on testing with arm64 defconfig, we found that a limit of 5 is a
reasonable compromise between performance and binary size, reducing the
size of a stripped vmlinux by 11%.

Suggested-by: George Burgess IV <gbiv@google.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/Makefile b/Makefile
index a07e3909e5d0..84c60f38ee3e 100644
--- a/Makefile
+++ b/Makefile
@@ -901,6 +901,9 @@  else
 CC_FLAGS_LTO	+= -flto
 endif
 CC_FLAGS_LTO	+= -fvisibility=hidden
+
+# Limit inlining across translation units to reduce binary size
+KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
 endif
 
 ifdef CONFIG_LTO