From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 25 Sep 2014 12:21:46 +0200 (CEST) Received: from www.linutronix.de ([62.245.132.108]:55775 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S27009753AbaIYKVng21g9 (ORCPT ); Thu, 25 Sep 2014 12:21:43 +0200 Received: from localhost ([127.0.0.1]) by Galois.linutronix.de with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1XX69u-0006Lp-E8; Thu, 25 Sep 2014 12:20:22 +0200 Date: Thu, 25 Sep 2014 12:20:20 +0200 (CEST) From: Thomas Gleixner To: Thierry Reding cc: Yijing Wang , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Xinwei Hu , Wuyun , linux-arm-kernel@lists.infradead.org, Russell King , linux-arch@vger.kernel.org, arnab.basu@freescale.com, Bharat.Bhushan@freescale.com, x86@kernel.org, Arnd Bergmann , Konrad Rzeszutek Wilk , xen-devel@lists.xenproject.org, Joerg Roedel , iommu@lists.linux-foundation.org, linux-mips@linux-mips.org, Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Sebastian Ott , Tony Luck , linux-ia64@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org, Chris Metcalf , Ralf Baechle , Lucas Stach , David Vrabel , Sergei Shtylyov , Michael Ellerman , Thomas Petazzoni Subject: Re: [PATCH v2 01/22] PCI/MSI: Clean up struct msi_chip argument In-Reply-To: <20140925071536.GG12423@ulmo> Message-ID: References: <1411614872-4009-1-git-send-email-wangyijing@huawei.com> <1411614872-4009-2-git-send-email-wangyijing@huawei.com> <20140925071536.GG12423@ulmo> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 42811 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: tglx@linutronix.de Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips On Thu, 25 Sep 2014, Thierry Reding wrote: > On Thu, Sep 25, 2014 at 11:14:11AM +0800, Yijing Wang wrote: > > Msi_chip functions setup_irq/teardown_irq rarely use msi_chip > > argument. > > That's not true. Out of the four drivers that you modify two use the > parameter. And the two that don't probably should be using it too. > > 50% is not "rarely". =) > > > We can look up msi_chip pointer by the device pointer > > or irq number, so clean up msi_chip argument. > > I don't like this particular change. The idea was to keep the API object > oriented so that drivers wouldn't have to know where to get the MSI chip > from. It also makes it more resilient against code reorganizations since > the core code is the only place that needs to know where to get the chip > from. Right. We have the same thing in the irq_chip callbacks. All of them take "struct irq_data", because it's already available in the core code and it gives easy access to all information (chip, chipdata ...) which is necessary for the callback implementations. Thanks, tglx