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 A142C174EF9 for ; Thu, 18 Apr 2024 17:44:52 +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=1713462293; cv=none; b=IMD0IKLl62kCwx4DqHbVL1rncIyBycqR5Nt6u/cbwqlqkoK2ddBQWWITo8frtWZLQu74Pmeklfd6Nl7rGsdJmBHPyrFmr0RkTa/yhx3UPpo5bRw9PNv2ue/wXb4hOyck+owakZ5yBHEbWtrn/+nXk65S+hAA1EyORERPICHli44= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713462293; c=relaxed/simple; bh=EndrSlUL8lOUGOcQbCMTZWu/7CtEhpYfDQ/0p0uQKLs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=T1IAEq3GJt1U36OeaUqjsRrXI8R9cGbfphL8+6ukEjfanTLIrshIrAhj6hGC9G4EtxWZUXXpF8dBP1l7cxm2nWkPVQ3+O+IT7a5RftPbBSj1lh0mhp9rzBH7YE4VhYY7hM2hZJ60A8rLHPFN6UEtNj0ZRLZ04C/qJeNWw2LMcmg= 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=ZlEkK+hS; 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="ZlEkK+hS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=xry111.site; s=default; t=1713462283; bh=EndrSlUL8lOUGOcQbCMTZWu/7CtEhpYfDQ/0p0uQKLs=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=ZlEkK+hSEytOWrYlgHowGpBxHnRBlr2XVpDMd/0GBYgOboQopAsDNuFVcOC6n2wmY 7xAhePZtZJisDQjP1mRpYoWGNRbuVgOxS8d8CGyJQ2THyRm4luUOCc00MamIW7jPAm cgWQ4EdxM3Tkkt65Eqz7cHwcpt9nJzvnF/8bwbNc= Received: from [127.0.0.1] (unknown [IPv6:2001:470:683e::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-384) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@xry111.site) by xry111.site (Postfix) with ESMTPSA id A770C1A3F62; Thu, 18 Apr 2024 13:44:41 -0400 (EDT) Message-ID: <5e005ed913086d7e641306b89baa29b070e0359b.camel@xry111.site> Subject: Re: [PATCH v3 0/4] Give chance to build under !CONFIG_SMP for LoongArch From: Xi Ruoyao To: Arnd Bergmann , Huacai Chen , Marc Zyngier , Tiezhu Yang Cc: Thomas Gleixner , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn Date: Fri, 19 Apr 2024 01:44:39 +0800 In-Reply-To: References: <20240411010510.22135-1-yangtiezhu@loongson.cn> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-04-11 at 08:06 +0200, Arnd Bergmann wrote: > On Thu, Apr 11, 2024, at 06:26, Huacai Chen wrote: > >=20 > > I remember that you both suggested not introducing NOSMP support for a > > modern architecture which brings additional complexity. I wonder if > > you still have the same attitude now. I will merge this series only if > > you think it is worthy to introduce NOSMP now. >=20 > It's an interesting question, as we have recently discussed two > opposite ideas and may end up doing both (or possible neither) > in the future: >=20 > - On x86, there is no real reason to need non-SMP kernels as the > =C2=A0 memory savings are fairly small, and it tends to break because > =C2=A0 of lack of users testing it. FWIW I'm still running the latest Linux kernel on a Athlon 64 3000+ launched in 2004 with !CONFIG_SMP :). No objection to this paragraph (and other paragraphs) though. --=20 Xi Ruoyao School of Aerospace Science and Technology, Xidian University