linux-kernel - Re: sparc/staging compile error

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Date:	Thu, 6 Nov 2008 12:32:24 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	"J.R. Mauro" <jrm8005@...il.com>
Cc:	Paul Mackerras <paulus@...ba.org>, Greg KH <greg@...ah.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"William L. Irwin" <wli@...omorphy.com>, sparclinux@...r.kernel.org
Subject: Re: sparc/staging compile error

On Thu, Nov 06, 2008 at 09:06:36AM -0500, J.R. Mauro wrote:
> static int poch_ioctl(struct inode *inode, struct file *filp,
>                       unsigned int cmd, unsigned long arg)
> {
> /* ---snip---*/
>         case POCH_IOC_SYNC_GROUP_FOR_USER:
>         case POCH_IOC_SYNC_GROUP_FOR_DEVICE:
>                 vms = find_vma(current->mm, arg);
>                 if (!vms)
>                         /* Address not mapped. */
>                         return -EINVAL;
>                 if (vms->vm_file != filp)
>                         /* Address mapped from different device/file. */
>                         return -EINVAL;
> 
>                 flush_cache_range(vms, arg, arg + channel->group_size);

This doesn't look like something a driver should ever do.  Could someone
explain what it's trying to do from a high level point of view?

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