On Wed, 2014-05-14 at 07:34 +0800, Herbert Xu wrote: > > Why do we need this patch since kmap_atomic is equivalent to > page_address plus preempt_disable on x86-64?
For multi-buffers, you may still have some data lanes with jobs that are partially completed when you need to put the thread to sleep. With kmap_atomic, you cannot sleep before unmapping. Thanks. Tim -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
