Re: Problem with remap_page_range/mmap

[Christoph Hellwig]

On Fri, Mar 26, 2004 at 12:48:04AM +0100, Christian Leber wrote:
> addr = __get_free_pages(GFP_KERNEL,0);
> int atoll_fops_mmap(struct file *filp, struct vm_area_struct *vma)
> {
>         vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
> 	
> 	if(remap_page_range_A(vma,
> 		vma->vm_start, addr, 4096,
> 		vma->vm_page_prot)) {
> 			printk("remapping send space failed\n");
> 			return -ENXIO;
> 	}

You can't call remap_page_range on normal kernel pages.  It works only
if you mark them PG_reserved, but even that use is usually not a good idea.

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