Re: Creating tasks on restart: userspace vs kernel

Alexey Dobriyan
2009-04-14T16:46:24Z

> 1) somebody should write registers before final jump to userspace.
> Task itself can't generally do it: struct pt_regs is in the same place
> as kernel stack.
>
> cr_load_cpu_regs() does exactly this: as current writes to it's own
> pt_regs. Oren, why don't you see crashes?
>
> I first tried to do it and was greeted with horrible crashes because
> e.g current becoming NULL under current. That's why
> cr_arch_restore_task_struct() is not done in current context.

Hmm, this must an artefact of kernel_thread() approach.