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[46.139.12.213]) by smtp.gmail.com with ESMTPSA id r18sm3417736wme.18.2019.04.18.06.20.49 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 18 Apr 2019 06:20:49 -0700 (PDT) Date: Thu, 18 Apr 2019 15:20:47 +0200 From: Ingo Molnar To: Masahiro Yamada Cc: Andrew Morton , linux-arch , linux-arm-kernel@lists.infradead.org, Ingo Molnar , Paul Burton , linux-mips@vger.kernel.org, x86@kernel.org, linux-mtd@lists.infradead.org, Arnd Bergmann , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, Dave Hansen , linuxppc-dev@lists.ozlabs.org, Michael Ellerman Subject: Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING Message-ID: <20190418132047.GA21430@gmail.com> References: <1553062828-27798-1-git-send-email-yamada.masahiro@socionext.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1553062828-27798-1-git-send-email-yamada.masahiro@socionext.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org * Masahiro Yamada 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