Messages in this thread | | | Date | Thu, 18 Apr 2019 15:20:47 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING |
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* Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
> Commit 60a3cdd06394 ("x86: add optimized inlining") introduced > CONFIG_OPTIMIZE_INLINING, but it has been available only for x86. > > The idea is obviously arch-agnostic although we need some code fixups. > This commit moves the config entry from arch/x86/Kconfig.debug to > lib/Kconfig.debug so that all architectures (except MIPS for now) can > benefit from it. > > At this moment, I added "depends on !MIPS" because fixing 0day bot reports > for MIPS was complex to me. > > I tested this patch on my arm/arm64 boards. > > This can make a huge difference in kernel image size especially when > CONFIG_OPTIMIZE_FOR_SIZE is enabled. > > For example, I got 3.5% smaller arm64 kernel image for v5.1-rc1. > > dec file > 18983424 arch/arm64/boot/Image.before > 18321920 arch/arm64/boot/Image.after > > This also slightly improves the "Kernel hacking" Kconfig menu. > Commit e61aca5158a8 ("Merge branch 'kconfig-diet' from Dave Hansen') > mentioned this config option would be a good fit in the "compiler option" > menu. I did so.
No objections against moving it from x86 code to generic code.
Thanks,
Ingo
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