On Wed, 2025-02-26 at 14:08 +0100, Ingo Molnar wrote:
>
> * Benjamin Berg wrote:
>
> > From: Benjamin Berg
> >
> > The init_task instance of struct task_struct is statically allocated and
> > may not contain the full FP state for userspace. As such, limit the copy
> > to the valid area of init
* Benjamin Berg wrote:
> > Note that this patch, while it still applies cleanly, crashes/hangs
> > the x86-64 defconfig kernel bootup in the early boot phase in a KVM
> > guest bootup.
>
> Oh, outch. It seems that arch_task_struct_size can actually become
> smaller than sizeof(init_task) if
* Benjamin Berg wrote:
> From: Benjamin Berg
>
> The init_task instance of struct task_struct is statically allocated and
> may not contain the full FP state for userspace. As such, limit the copy
> to the valid area of init_task and fill the rest with zero.
>
> Note that the FP state is onl
From: Benjamin Berg
The init_task instance of struct task_struct is statically allocated and
may not contain the full FP state for userspace. As such, limit the copy
to the valid area of init_task and fill the rest with zero.
Note that the FP state is only needed for userspace, and as such it is
