On Mon, Jan 08, 2018 at 09:28:12AM -0800, Tim Chen wrote: > On 01/08/2018 08:14 AM, Peter Zijlstra wrote: > > On Mon, Jan 08, 2018 at 01:47:07PM +0100, Peter Zijlstra wrote: > >>> a good suggestion, but we encountered some issues with it either > >>> crashing the kernel at boot or not properly turning on/off. > > > > The below boots, but I lack stuff to test the enabling. > > Peter, > > Thanks. Will give it a spin. One other concern is if > JUMP_LABEL is not configured, this may not work, and > we may still need fall back to a control variable.
Urgh yes.. I always forget about that case. Will the retpoline crud be backported to a GCC old enough to not have asm-goto? If not, we could make all of this simply require asm-goto.
