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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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