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Date: Thu, 17 Jun 2010 19:00:59 +0100
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "jeremy@goop.org" <jeremy@goop.org>,
       "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
       "ddutile@redhat.com" <ddutile@redhat.com>,
       "sheng@linux.intel.com" <sheng@linux.intel.com>
Subject: Re: [Xen-devel] [PATCH 12/12] Unplug emulated disks and nics
In-Reply-To: <20100617174622.GB17523@phenom.dumpdata.com>
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On Thu, 17 Jun 2010, Konrad Rzeszutek Wilk wrote:
> If was thinking of something like this in the header file:
> 
> 
> int xen_must_unplug_nics() {
> #if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \
> 		defined(CONFIG_XEN_NETDEV_FRONTEND_MODULE)) && \
> 		(defined(CONFIG_XEN_PLATFORM_PCI) || \
> 		 defined(CONFIG_XEN_PLATFORM_PCI_MODULE))
> 	return 1;
> #else
> 	return 0;
> }
> 
> and then your code would be:
> 
> 	if (xen_must_unplug_nics()) {
> 		printk(".. blah blah ");
> 		xen_emul_unplug |- XEN_unPLIG_ALL_NICS;
> 	}
> 
> and similar for the IDE disks.
> 

this seems actually better, I'll do that

> > 
> > 
> > > > +	}
> > > > +	/* Now unplug the emulated devices */
> > > > +	if (xen_platform_pci_enabled && !(xen_emul_unplug & XEN_UNPLUG_IGNORE))
> > > > +		outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
> > > > +}
> > > > +
> > > > +static int __init parse_xen_emul_unplug(char *arg)
> > > > +{
> > > > +	char *p, *q;
> > > > +
> > > > +	for (p = arg; p; p = q) {
> > > > +		q = strchr(arg, ',');
> > > > +		if (q)
> > > > +			*q++ = '\0';
> > > > +		if (!strcmp(p, "all"))
> > > > +			xen_emul_unplug |= XEN_UNPLUG_ALL;
> > > 
> > > strncmp..
> > > 
> > 
> > is it really needed considering that we know that both strings are NULL
> > terminated and one of them is a constant?
> 
> Please do.
> 

all right