linux-kernel - Re: [Xen-devel] [PATCH 12/12] Unplug emulated disks and nics

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Message-ID: <20100614212017.GA8600@phenom.dumpdata.com>
Date:	Mon, 14 Jun 2010 17:20:17 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	stefano.stabellini@...citrix.com
Cc:	linux-kernel@...r.kernel.org, jeremy@...p.org,
	xen-devel@...ts.xensource.com, ddutile@...hat.com,
	sheng@...ux.intel.com
Subject: Re: [Xen-devel] [PATCH 12/12] Unplug emulated disks and nics

> +#if (defined(CONFIG_XEN_NETDEV_FRONTEND) || \
> +		defined(CONFIG_XEN_NETDEV_FRONTEND_MODULE)) && \
> +		(defined(CONFIG_XEN_PLATFORM_PCI) || \
> +		 defined(CONFIG_XEN_PLATFORM_PCI_MODULE))
> +		printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
> +				"been compiled for this kernel: unplug emulated NICs.\n");
> +		xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
> +#endif
> +#if (defined(CONFIG_XEN_BLKDEV_FRONTEND) || \
> +		defined(CONFIG_XEN_BLKDEV_FRONTEND_MODULE)) && \
> +		(defined(CONFIG_XEN_PLATFORM_PCI) || \
> +		 defined(CONFIG_XEN_PLATFORM_PCI_MODULE))
> +		printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
> +				"been compiled for this kernel: unplug emulated disks.\n"
> +				"You might have to change the root device\n"
> +				"from /dev/hd[a-d] to /dev/xvd[a-d]\n"
> +				"in your root= kernel command line option\n");
> +		xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
> +#endif

Wow. Can you move those checks to the header file and make it deal with
the #ifdef and setting of xen_emul_unplug?

> +	}
> +	/* 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..
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