From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7E34EC55184 for ; Tue, 4 Aug 2026 15:58:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=b+1h/BQsqY74flNV7K6I6cQt2Nw8Fe1oJBqLFnkhi3Q=; b=RYd+nrkcp+IE4D3iVFKzkbtcag yZ6pFFLxg+B1TPRcT62R2jNzmaU/DfFBVwBjgldX+LTeYsVNQ0dvKapWpiR9DwJikFsWZIejUa2KK 4JL8Zr6a52weUYEuI6DpqB6TpxbCaCfvpo9fy9W3Vm1/IzHrzKnPaBRyQKjK61rtzpk7fTdOfCO5X d+xWw+JsWQ2yHT8ihICc0fHygh3i6VYdbVNeD6zUP2dIqnkqjZRyiN6ZlNASgql+hYhKqvr6voUz0 wKikeJjAkl/OVbNlW+zzm5rTHvB1UfcqRR4Kd6rNc7M23gW7ltLJ8fSl/bia7j3lRsQLLBESjjnyd z+pJ3hoQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrHWo-00000002FlJ-2GAH; Tue, 04 Aug 2026 15:58:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wrHWl-00000002Fkp-3E6z for linux-arm-kernel@lists.infradead.org; Tue, 04 Aug 2026 15:58:05 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 44FF71476; Tue, 4 Aug 2026 08:57:58 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8074F3F86F; Tue, 4 Aug 2026 08:58:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785859082; bh=KhwAtM0UItUER3IXbqDdE6lFQSu0rls/C4cvOSiwBqs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=gcTL6/enZyscEbetKmwZQI4x0bObIGbedbdFRkHqzrrWh99MWPF4qZXLAllUzW2Ts hlQk3JUZY7Acwc3s6S7+rM4zpar54T7UdaPRifuum1GsaVFDWdbibYGX5ZdpTEOGat 1Qi3cBITNrwwfYcseriAQhhW1egTZHyLFgQo0irA= Date: Tue, 4 Aug 2026 16:57:54 +0100 From: Catalin Marinas To: Bradley Morgan Cc: will@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] [Question] memset.S old code stuff Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260804_085803_931667_B0A0FCF5 X-CRM114-Status: GOOD ( 10.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jul 23, 2026 at 12:17:15AM +0100, Bradley Morgan wrote: > Hey folks, sorry for the crazy asm emails, I see that in memset.S in > arch/arm64/lib/memset.S, the code is incredibly old code, like 2013 old > (heh). > > I was wondering if I could say, adapt it from optimized-routines (same > treatment as memcpy.S essentially. I think Robin attempted until he realised the use of the Q registers in the Cortex Strings library, mentioned here: https://lore.kernel.org/all/cover.1571073960.git.robin.murphy@arm.com/ So that's where Cortex Strings diverged from what we can use in the kernel. -- Catalin