On Fri, Aug 28, 2020 at 05:52:05PM +0800, Huacai Chen wrote: > Hi, Thomas, > > On Fri, Aug 28, 2020 at 5:34 PM Thomas Bogendoerfer > <tsbogend@xxxxxxxxxxxxxxxx> wrote: > > if it is enabled at that point, it was already enabled in kernel. > In kernel FPU may be enabled temporarily, and it seems a preemptible > kernel may enable FPU for a new process (maybe I'm wrong, this is a > bit complex). no you are completly right. We need to clear CU1 in this place otherwise a orphan cpu warning will trigger. It's enabled, if the current thread owns it, but the newly created thread doesn't. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
