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SubjectRe: [PATCH 5/9] arm64: correctly check for ktrheads
On Wed, Aug 14, 2019 at 11:41:27AM +0100, Mark Rutland wrote:
> Since commit:
>
> 6eb6c80187c55b7f ("arm64: kernel thread don't need to save fpsimd context.")
>
> ... we skip saving the fpsimd state for kernel threads in
> arch_dup_task_struct(). We determine whether current is a kthread by
> looking at current->mm.
>
> In general, a non-NULL current->mm doesn't imply that current is a
> kthread, as kthreads can install an mm via use_mm(), and so it's
> preferable to use is_kthread() to determine whether a thread is a
> kthread.
>
> For consistency, let's use is_kthread() here.
>
> Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Will Deacon <will@kernel.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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