On Fri, 30 Nov 2012 16:13:16 +0900 Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > > What about futexes? > > > > IIUC, futex's key is now a pair of (mm,address) or (inode, pgoff). > Then, get_user_page() in futex.c will release the page by put_page(). > 'struct page' is just touched by get_futex_key() to obtain page->mapping info. Ah yes, that page is unpinned before syscall return. grep -rl get_user_pages . Gad. These should be audited. The great majority will be simple and OK, but drivers/media, drivers/infiniband and net/rds could be problematic. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>