On Mon, Dec 14, 2015 at 09:36:25AM +0100, Ingo Molnar wrote: > > /* deal with it */ > > > > That way the magic is isolated to the function that needs the magic. > > Seconded - this is the usual pattern we use in all assembly functions. Ok - you want me to write some x86 assembly code (you may regret that). Initial question ... here's the fixup for __copy_user_nocache() .section .fixup,"ax" 30: shll $6,%ecx addl %ecx,%edx jmp 60f 40: lea (%rdx,%rcx,8),%rdx jmp 60f 50: movl %ecx,%edx 60: sfence jmp copy_user_handle_tail .previous Are %ecx and %rcx synonyms for the same register? Is there some super subtle reason we use the 'r' names in the "40" fixup, but the 'e' names everywhere else in this code (and the 'e' names in the body of the original function)? -Tony -- 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>