Re: Creating tasks on restart: userspace vs kernel

[Alexey Dobriyan <adobriyan@gmail.com>]

> 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.