Re: [PATCH 4/3] x86/fpu: don't use current->mm to check for a kthread

[Borislav Petkov]

On Tue, Jun 04, 2019 at 07:54:12PM +0200, Christoph Hellwig wrote:
> current->mm can be non-NULL if a kthread calls use_mm.  Check for
> PF_KTHREAD instead to decide when to store user mode FP state.
> 
> Fixes: 2722146eb784 ("x86/fpu: Remove fpu->initialized")
> Reported-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  arch/x86/include/asm/fpu/internal.h | 6 +++---
>  arch/x86/kernel/fpu/core.c          | 3 ++-
>  2 files changed, 5 insertions(+), 4 deletions(-)

I had to take this one first because of the Fixes: tag and expedite it
through tip:x86/urgent. Check the tip-bot notification mail whether it
is still ok.

I'll redo the other ones ontop, or you can if you feel bored. :)

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.