From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261669AbVHDAuF (ORCPT ); Wed, 3 Aug 2005 20:50:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261665AbVHDAsF (ORCPT ); Wed, 3 Aug 2005 20:48:05 -0400 Received: from fmr17.intel.com ([134.134.136.16]:57557 "EHLO orsfmr002.jf.intel.com") by vger.kernel.org with ESMTP id S261669AbVHDApz (ORCPT ); Wed, 3 Aug 2005 20:45:55 -0400 Subject: Re: [ACPI] Re: [PATCH] PNPACPI: fix types when decoding ACPI resources [resend] From: Shaohua Li To: Bjorn Helgaas Cc: acpi-devel@lists.sourceforge.net, Adam Belay , Matthieu Castet , linux-kernel@vger.kernel.org In-Reply-To: <200508030920.13450.bjorn.helgaas@hp.com> References: <200508020955.54844.bjorn.helgaas@hp.com> <1123030861.2937.4.camel@linux-hp.sh.intel.com> <200508030920.13450.bjorn.helgaas@hp.com> Content-Type: text/plain Date: Thu, 04 Aug 2005 08:46:35 +0800 Message-Id: <1123116395.2929.1.camel@linux-hp.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 (2.2.2-5) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2005-08-03 at 09:20 -0600, Bjorn Helgaas wrote: > On Tuesday 02 August 2005 7:01 pm, Shaohua Li wrote: > > On Tue, 2005-08-02 at 09:55 -0600, Bjorn Helgaas wrote: > > > Any objections to the patch below? I posted it last Wednesday, > > > but haven't heard anything. Once we have this fix, 8250_pnp > > > should have sufficient functionality that we can get rid of > > > 8250_acpi. > > > > > > Use types that match the ACPI resource structures. Previously > > > the u64 value from an RSTYPE_ADDRESS64 was passed as an int, > > > which corrupts the value. > > > > > > This is one of the things that prevents 8250_pnp from working > > > on HP ia64 boxes. After 8250_pnp works, we will be able to > > > remove 8250_acpi.c. > > We might always use 'unsigned long'. > > Do you have a reason for preferring 'unsigned long' over the > exact types used in the ACPI resource structures? I thought > it was useful to use the exact types, because then whatever > conversion needs to happen is all in one place. > > In the existing code, there's implicit conversion when you > call "pnpacpi_parse_allocated_memresource(..., int mem, int len)" > and pass u64 values as "mem" and "len". You have to look both > at the call site and the called code. And gcc doesn't even > complain about this truncation. > > But I guess it doesn't matter much either way. Either is ok to me. > > > Did you have plan to remove other > > legacy acpi drivers? > > No, I didn't -- which ones are you thinking about? Looking at > the callers of acpi_bus_register_driver(), I see: > > arch/ia64/hp/common/sba_iommu.c > Probably can't be converted because it needs the > ACPI handle to extract a vendor-specific data > item from _CRS. > > drivers/char/hpet.c > This probably should be converted to PNP. I'll > look into doing this. Great! After then we could push the ACPIPNP hotplug staff. Thanks, Shaohua