linux-kernel - Re: sparc/staging compile error

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Date:	Thu, 6 Nov 2008 12:36:11 -0500
From:	"J.R. Mauro" <jrm8005@...il.com>
To:	"Christoph Hellwig" <hch@...radead.org>
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>, vijaykumar@...vegnu.org,
	jayakumar.lkml@...il.com, sparclinux@...r.kernel.org
Subject: Re: sparc/staging compile error

On Thu, Nov 6, 2008 at 12:32 PM, Christoph Hellwig <hch@...radead.org> wrote:
> 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?
>
>

CC'd driver maintainers mentioned in the README
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