From mboxrd@z Thu Jan 1 00:00:00 1970 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.subspace.kernel.org (Postfix) with ESMTPS id 8A13C2C18A; Tue, 29 Jul 2025 07:32:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753774369; cv=none; b=FROnpzNHLxdwQDlLvwb+tXtTbAtYis6NuwtMWvCExDCWbJHETpILGzOl/jS5Bi16uvB/eT5xT0IsO5mL3KIB8lrC1dGI2Lp8JhlYTQiZlGg4xQt6GGYcwKo5O4RY/FODYBlRFTcjYEzBZH3tVQ1Eh9gFNjlyE4COlwe/E3qg7ZE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753774369; c=relaxed/simple; bh=gu9Vfn3Xnc+YB01hXHBmYpL8Kd8tfPplc9en4o/NvuI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=SyJVfQRIoclQxqJItDLtt4tU75p3s2A3ulXkWKhR+g/H3YZuspRtEfzoQWBU6GYVQ5fPe1XkpJKjf6PwNqoevKBwDSEKX5KsOzXGS6V5j674+lcVe0k/YFgWvnTxNQ3jL2TekizofuW3tAYr0n1PQsX107EceuNPGTchICKYfrw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=p13g40gx; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="p13g40gx" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=0MWTGeSb5WN5PjPAy3ePZECj7+qyiS1J4g1426SAwvo=; b=p13g40gx2oUQ/u2Q9UTlFvBkCu m0+03OcSXYkp6ifGSOcWs1wzFuuFZ5iKZAssEqubxTLtQ4Vl8mXROf4Lo9lwje/kAdyVUJK9Z5ras XyiGR+QpY6eifpRmvkHZhAqnm2nNUFgm2HIRPpwZnHnQwgPrNfK7hLJZ6IlCALmz5B95JLuMswaxE BZZAHBegMxMtymRX5zoGMEw4EnMqE3+w+rxObpMT+7OYGX5WM4amSWY44BzQno3jivTkG98mTQ9Ao jpVW4oU+M7pkyGFTn4L4ADkLaFAzEKUXfSPHmaVFxXvBPiMN1o6wy2OjUg/YE1yqexu40hx7yTbVi +5LUOE+A==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1ugepJ-0000000G7wq-2svP; Tue, 29 Jul 2025 07:32:45 +0000 Date: Tue, 29 Jul 2025 00:32:45 -0700 From: Christoph Hellwig To: Magnus Lindholm Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-alpha@vger.kernel.org, martin.petersen@oracle.com, James.Bottomley@hansenpartnership.com, hch@infradead.org, macro@orcam.me.uk Subject: Re: [PATCH 1/1] scsi: qla1280: Make 64-bit DMA addressing a Kconfig option Message-ID: References: <20250728163752.9778-1-linmag7@gmail.com> <20250728163752.9778-2-linmag7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250728163752.9778-2-linmag7@gmail.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Mon, Jul 28, 2025 at 06:34:14PM +0200, Magnus Lindholm wrote: > Make 64-bit DMA addressing a Kconfig option. > > While defaulting to 64-bit addressing, this gives the user the option > to revert to 32-bits when necessary without messing with the kernel > source. The Kconfig help text also points out the issues with tsunami > based alphas with more than 2GB RAM and 32-bit PCI Qlogic SCSI > controllers. Compile time options like this are annoying as they require distributions to pick a default. Why not at least a module option even if it just a workaround?