Re: [PATCH 6/9] sparc/perf: correctly check for kthreads

[David Miller]

From: Mark Rutland <mark.rutland@xxxxxxx>
Date: Wed, 14 Aug 2019 11:41:28 +0100

> The sparc perf_callchain_user() functions looks at current->mm,
> apparently to determine whether the thread is a kthread without any
> valid user context.
> 
> 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@xxxxxxx>

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>