On 2019-08-14 14:39:10 [+0100], Mark Rutland wrote:
> I think this was missed in commit.
> > 8d3289f2fa1e0 ("x86/fpu: Don't use current->mm to check for a kthread")
>
> Yup, though if it's a bug it's been a bug since commit:
>
> 0cecca9d03c964ab ("x86/fpu: Eager switch PKRU state")
>
> ..
On Wed, Aug 14, 2019 at 03:07:08PM +0200, Sebastian Andrzej Siewior wrote:
> On 2019-08-14 11:41:30 [+0100], Mark Rutland wrote:
> > Per commit:
> >
> > 0cecca9d03c964ab ("x86/fpu: Eager switch PKRU state")
> >
> > ... switch_fpu_state() is trying to distinguish user threads from
> > kthreads,
On 2019-08-14 11:41:30 [+0100], Mark Rutland wrote:
> Per commit:
>
> 0cecca9d03c964ab ("x86/fpu: Eager switch PKRU state")
>
> ... switch_fpu_state() is trying to distinguish user threads from
> kthreads, such that kthreads consistently use init_pkru_value. It does
> do by looking at current->
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