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    SubjectRe: 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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