From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from xry111.site (xry111.site [89.208.246.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A249628C84C for ; Thu, 28 Aug 2025 07:12:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=89.208.246.23 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756365131; cv=none; b=Qsyb60/KiSGhyLVfgF8IEaWU5cLQ7cTVdQSaIVunxKOOlkeXEcAZJzS9QDQMrbOj+JuCbAvi6hskBdkkJkzQigiD5xD9ZHix9T810ARmR3jVXh967ZfkmCpoYukmFK4hk2XqutzTMOaKtabh7JHG+G4ANQXyJi3zJXy5DvuWMLU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756365131; c=relaxed/simple; bh=X0ReWVy/9bRIZByWU1a4LxZFCHhsB6SDNoJO/V5qW6k=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kf429+1MwWO6rxMMlA+gdCcqQOUcbHxHU74ZL0uUE6BKTpiJlq2YVCDj8GYcAg/c4XQJXuuRMmB66dQDPaqNyMR0LaWtZWYxlEgqUs3zngu+EA7yFFBo52Vts0TlkAa7t2Ow/1uKPzNvas+Yvm8Zb7FrrEah3fxfp68G05zDSDs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=xry111.site; spf=pass smtp.mailfrom=xry111.site; dkim=pass (1024-bit key) header.d=xry111.site header.i=@xry111.site header.b=jwaBlKKZ; arc=none smtp.client-ip=89.208.246.23 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=xry111.site Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=xry111.site Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=xry111.site header.i=@xry111.site header.b="jwaBlKKZ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xry111.site; s=default; t=1756365129; bh=2OR7QGlfaXKbbhmoHE/dYhnXZMft1PS1VCZ/6tJ9vr4=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jwaBlKKZLxoFHt6YjYTV8msCnlnHUwAQLWnsUkXzw+O4RGp9XX5uTAF66EBq0wzly GPFyPzmMgUer0f+nmrSg9x1MYCakNIfjTQSoRW7l3jSIZ3/RrNhXWTGPTGQ6utascD fTmQXtKzjV4pryCHNRcIfUUO4UPJbogNLBrzrFZg= Received: from [IPv6:110::b] (unknown [IPv6:2409:874d:200:3037::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (secp384r1) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@xry111.site) by xry111.site (Postfix) with ESMTPSA id 13BD466EFB; Thu, 28 Aug 2025 03:12:06 -0400 (EDT) Message-ID: <601863349f71b54087bc7ffa382955ad6bbf5511.camel@xry111.site> Subject: Re: [PATCH] Loongarch: entry: fix syscall_get_arguments() VS no-bultin-memcpy From: Xi Ruoyao To: Huacai Chen , Wentao Guan Cc: WANG Xuerui , linux-kernel , loongarch , =?gb2312?Q?=D5=BC=BF=A1?= Date: Thu, 28 Aug 2025 15:11:57 +0800 In-Reply-To: References: <20250826113225.406238-1-guanwentao@uniontech.com> <20d3df642aaff2a771e74452b81463709f7c16d1.camel@xry111.site> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2025-08-28 at 15:09 +0800, Huacai Chen wrote: > On Thu, Aug 28, 2025 at 3:06=E2=80=AFPM Wentao Guan > wrote: > >=20 > > Hello Ruoyao, > >=20 > > Thanks for your review. > > I will test and send test results later. > > (use different gcc verions and remove the three flags.) > I think kernel's memcpy is still needed for CPUs without UAL. GCC memcpy expansion correctly understands no-UAL case. It won't generate unaligned access unless -mno-strict-align. --=20 Xi Ruoyao