> > + data = memdup_user((void __user *)(unsigned long)src, len); > > + if (IS_ERR(data)) > > + return PTR_ERR(data); > This cast look strange, can it happen that (unsigned long)<(u64) ? > (is there a 32bit infiniband) ? There is 32-bit infiniband. Linux kernel assumes that unsigned long is equivalent to uintptr_t -- in other words all pointers are the same size as longs. So when casting from integer to pointer we add a cast to unsigned long to avoid a warning precisely in the 32-bit case -- we would get a warning about cast to pointer from integer of different size when casting from 64-bit integer to 32-bit pointer. -- Roland Dreier <rolandd@xxxxxxxxx> || For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/index.html -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
