On Wed, Apr 21, 2010 at 10:58:07PM +0200, Andrea Arcangeli wrote: > On Wed, Apr 21, 2010 at 10:53:05PM +0200, Johannes Weiner wrote: > > + * Returns the mapped (struct page *), %NULL if no mapping exists, or > > + * an error pointer if there is a mapping to something not represented > > + * by a page descriptor (see also vm_normal_page()). > > where exactly in vm_normal_page? Note I already checked vm_normal_page > before sending the prev email and I didn't immediately see. I search > return and they all return NULL except the return pfn_to_page(pfn), so > is pfn_to_page that returns -EFAULT (the implementations I checked > don't but there are plenty that I didn't check...). It's not vm_normal_page() that returns -EFAULT. It is follow_page() that translates NULL from vm_normal_page() into -EFAULT. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>