Hi Andy, On Fri, Sep 21, 2018 at 5:23 AM Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > At the risk on suggesting something awful: on x86_64, since we turn preemption off for simd, it wouldn’t be *completely* insane to do the crypto on the irq stack. It would look like: > > kernel_fpu_call(func, arg); > > And this helper would disable preemption, enable FPU, switch to the irq stack, call func(arg), disable FPU, enable preemption, and return. And we can have large IRQ stacks. > > I refuse to touch this with a ten-foot pole until the lazy FPU restore patches land. Haha. That's fun, and maybe we'll do that at some point, but I have some other reasons too for being on a workqueue now. > > All that being said, why are these frames so large? It sounds like something may be spilling that ought not to. They're not. Well, they're not anymore. I had a silly thing before like "u8 buffer[1 << 12]" in some debugging code, which is what prompted the ccflag-y addition. I cleaned up the mistakes like that and frames are now reasonable everywhere. Non-issue. Jason
