On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote: > Calling might_fault() for every __get_user/__put_user is rather expensive > because it turns what should be a single instruction (plus fixup) into an > external function call. We could hide it all behind CONFIG_DEBUG_ATOMIC_SLEEP just like might_sleep() is. I'm not sure there's a point to might_fault() when might_sleep() is a NOP. -- 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>