Anyway, can you resend with the commit message re-written. To me the information that's most useful is from the lwn article: "In short, if pages are being pinned for access to the data contained within those pages, pin_user_pages() should be used. For cases where the intent is to manipulate the page structures corresponding to the pages rather than the data within them, get_user_pages() is the correct interface." What are the runtime implications of this patch? I'm still not clear on that honestly. When I'm reviewing patches, I also want to know how a bug was introduced. In this case the original author did everything correctly but we've just added some new features (cleanups. whatever). I did skim the LWN article back in December but I don't remember the details so I really want all this stuff re-stated in each commit message. regards, dan carpenter _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel