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Message-Id: <20190814.122618.1414289033357500978.davem@davemloft.net>
Date: Wed, 14 Aug 2019 12:26:18 -0400 (EDT)
From: David Miller <davem@...emloft.net>
To: mark.rutland@....com
Cc: linux-kernel@...r.kernel.org, ak@...ux.intel.com,
akpm@...ux-foundation.org, bigeasy@...utronix.de, bp@...e.de,
catalin.marinas@....com, hch@....de, kan.liang@...el.com,
mingo@...nel.org, peterz@...radead.org, riel@...riel.com,
will@...nel.org
Subject: Re: [PATCH 6/9] sparc/perf: correctly check for kthreads
From: Mark Rutland <mark.rutland@....com>
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@....com>
Acked-by: David S. Miller <davem@...emloft.net>
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