From mboxrd@z Thu Jan 1 00:00:00 1970 From: yamada.masahiro@socionext.com (Masahiro Yamada) Date: Wed, 20 Sep 2017 19:58:34 +0900 Subject: [PATCH] arm64: relax assembly code alignment from 16 byte to 4 byte In-Reply-To: <20170907164651.3bmhdkbnxvj3pz7g@armageddon.cambridge.arm.com> References: <1504173383-8367-1-git-send-email-yamada.masahiro@socionext.com> <20170907164651.3bmhdkbnxvj3pz7g@armageddon.cambridge.arm.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Catalin, 2017-09-08 1:46 GMT+09:00 Catalin Marinas : > On Thu, Aug 31, 2017 at 06:56:23PM +0900, Masahiro Yamada wrote: >> Aarch64 instructions must be word aligned. The current 16 byte >> alignment is more than enough. Relax it into 4 byte alignment. >> >> Signed-off-by: Masahiro Yamada >> --- >> >> I do not know why arm64 Linux requires 16 byte alignment. >> >> I dug git-history of arch/arm64/include/asm/linkage.h >> and the only commit I see is: >> >> commit aeed41a9371ee02257b608eb06a9058507a7d0f4 >> Author: Marc Zyngier >> Date: Fri Oct 19 17:33:27 2012 +0100 >> >> arm64: fix alignment padding in assembly code >> >> It just opt out of the asm-generic variant to remove 0x90. >> So, the amount of alignment might not be not optimized yet. >> >> Please correct me if I am missing something. > > Not sure why we ended up with 4. Possibly because we forgot the power of > 2 difference for arm/arm64. > > Queued for 4.14. Thanks. I still do not see this patch in linux-next. Where was it queued? -- Best Regards Masahiro Yamada