linux-kernel - Re: linux-next: rr tree build failure

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Date:	Mon, 24 Nov 2008 14:41:32 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	Greg KH <gregkh@...e.de>, Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, katzj@...hat.com
Subject: Re: linux-next: rr tree build failure

On Sunday 23 November 2008 03:59:52 Pete Zaitcev wrote:
> On Fri, 21 Nov 2008 22:41:32 -0800, Greg KH <gregkh@...e.de> wrote:
> > > FYI, if Pete had discovered this __setup issue today, the correct fix
> > > would be:
> > > 1) core_param(nousb) for backwards compat.
> > > 2) module_param(disable) for modern users who want module/in-built
> > > symmetry (ie. boot cmdline "usbcore.disable", and "modprobe usbcore
> > > disable")
> >
> > Is there a real reason why we need to change this at all?

You're the only __module_param_call user outside moduleparam.h, and so an 
unrelated patch broke USB. :(

> As far as I know, in Fedora "nousb" is never used as a module parameter.
> It came about because interrupt tables are sometimes bad and once
> a request_irq() is done in an HCD, there's an interrupt storm. So,
> the "nousb" is mostly used in the SysLinux's command line, rarely
> in the real command line, and never in /etc/modprobe.conf.
> I'm adding Jeremy to cc: for confirmation.
>
> I think it would be good to try and drop "nousb" option in Fedora 11.
> The conflict with "nousbstorage" would resolve itself too if we do.

My original patch simply turned it into a core_param (ie. not valid as a 
module parameter).  If this had existed in 2005, it would have been the right 
answer.

If there's any chance of it actually breaking, let's leave it as a module 
parameter too (which is what the patch I sent does).

Thanks,
Rusty.
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