Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751430AbVJQQVY (ORCPT ); Mon, 17 Oct 2005 12:21:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751428AbVJQQVX (ORCPT ); Mon, 17 Oct 2005 12:21:23 -0400 Received: from mail.dvmed.net ([216.237.124.58]:32654 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1751425AbVJQQVW (ORCPT ); Mon, 17 Oct 2005 12:21:22 -0400 Message-ID: <4353CF7E.1090404@pobox.com> Date: Mon, 17 Oct 2005 12:21:18 -0400 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linus Torvalds CC: Andrew Morton , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, davej@redhat.com Subject: Re: [PATCH] libata: fix broken Kconfig setup References: <20051017044606.GA1266@havoc.gtf.org> <4353C42A.3000005@pobox.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3523 Lines: 108 Linus Torvalds wrote: > > On Mon, 17 Oct 2005, Jeff Garzik wrote: > >>CONFIG_SCSI_SATA does two things: >>* Enables/disables the display of the SATA driver menu. >>* Enables/disables the compiled-in PCI quirk. >> >>Both of these are boolean, and have absolutely nothing to do with modules. > > > You ignore the biggest thing it does: > - it is the depends-on for the actual low-level drivers That dependency for each driver exists solely for menu display purposes. There is no code dependency. > IOW, the _biggest_ reason for it existing at all is in fact _not_ a > boolean. It very much is a tristate. When it's "m" the SATA driver menu > _should_ show. The only operational difference between CONFIG_SCSI_SATA=y and CONFIG_SCSI_SATA=m is that CONFIG_SCSI_SATA=m restricts the drivers from being compiled in -- a silly and needless restriction. The elimination of 'y' as an option should propagate from CONFIG_SCSI. > Also, as already mentioned, that compiled-in PCI quirk is _wrong_. The > fact that somebody asked for SCSI_SATA should not change Intel settings. > Maybe somebody hass a separate SATA card, and has enabled support for > _that_, but wants the on-board thing to work with legacy drivers? The way > he'd have done that is to enable SCSI_SATA, but _not_ enable > SCSI_ATA_PIIX. Agreed this is a _theoretical_ problem. Never heard of this being an issue in the real world, because the IDE driver locks up on a lot of the Intel hardware in question. That was one of the original reason for the split PATA/SATA driver configuration, for this wonky combined mode. > Btw, if you want to really hide things (and not just gray them out) I > think you should do a > > menu "SATA low-level drivers" > depends on SCSI_SATA != n > > .. > > endmenu > > around the SATA drivers. No preference whether its hidden or greyed out. CONFIG_SCSI_SATA is just a switch to enable listing a set of drivers, just like CONFIG_NET_PCI (which I note is a bool), CONFIG_NET_ISA (a bool), ... >>Because it's fundamental a boolean, and has -zero- to do with modules. >>Encouraging people to think otherwise will just lead to more confusion. > > > I disagree. It is no more fundamentally boolean than anything else that > controls modules. It's a tristate, because it chooses between the > low-level drivers being tristate. > > I also think that the _only_ thing your ugly patch fixes was totally wrong > for wholly other reasons anyway. If that quirk is needed, it really looks > like it should be > > #if defined(CONFIG_SCSI_SATA_PIIX) || defined(CONFIG_SCSI_SATA_PIIX_MODULE) > .. > #endif If IDE is compiled in, IDE SATA option is not enabled, and ata_piix or ahci are used. Do we really want to do #if defined (CONFIG_IDE_GENERIC) && !defined(CONFIG_IDE_BLK_DEV_SATA) && ( defined(CONFIG_SCSI_SATA_PIIX) || defined(CONFIG_SCSI_SATA_PIIX_MODULE) || defined(CONFIG_SCSI_SATA_AHCI || defined(CONFIG_SCSI_SATA_AHCI_MODULE) ) ? At that point it seems easier to solve at the Kconfig level, perhaps defining CONFIG_SATA_INTEL_COMBINED at the end. And then with the quirk issue out of the way, CONFIG_SCSI_SATA becomes purely a boolean enable/disable-this-menu switch. Jeff - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/