From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-kernel@vger.kernel.org, ak@linux.intel.com,
akpm@linux-foundation.org, bigeasy@linutronix.de, bp@suse.de,
davem@davemloft.net, hch@lst.de, kan.liang@intel.com,
mingo@kernel.org, peterz@infradead.org, riel@surriel.com,
will@kernel.org
Subject: Re: [PATCH 5/9] arm64: correctly check for ktrheads
Date: Wed, 14 Aug 2019 17:40:28 +0100 [thread overview]
Message-ID: <20190814164028.GC54611@arrakis.emea.arm.com> (raw)
In-Reply-To: <20190814104131.20190-6-mark.rutland@arm.com>
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>
next prev parent reply other threads:[~2019-08-14 16:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 10:41 [PATCH 0/9] kthread detection cleanup Mark Rutland
2019-08-14 10:41 ` [PATCH 1/9] sched/core: add is_kthread() helper Mark Rutland
2019-08-14 11:26 ` Geert Uytterhoeven
2019-08-14 11:32 ` Mark Rutland
2019-08-19 8:52 ` Ingo Molnar
2019-08-21 11:21 ` Peter Zijlstra
2019-08-14 10:41 ` [PATCH 2/9] sched: treewide: use is_kthread() Mark Rutland
2019-08-14 11:27 ` Geert Uytterhoeven
2019-08-14 12:39 ` Sebastian Andrzej Siewior
2019-08-14 13:35 ` Mark Rutland
2019-08-14 13:37 ` Valentin Schneider
2019-08-14 10:41 ` [PATCH 3/9] kmemleak: correctly check for kthreads Mark Rutland
2019-08-14 16:39 ` Catalin Marinas
2019-08-14 10:41 ` [PATCH 4/9] arm/perf: " Mark Rutland
2019-08-14 10:41 ` [PATCH 5/9] arm64: correctly check for ktrheads Mark Rutland
2019-08-14 16:40 ` Catalin Marinas [this message]
2019-08-14 10:41 ` [PATCH 6/9] sparc/perf: correctly check for kthreads Mark Rutland
2019-08-14 16:26 ` David Miller
2019-08-14 10:41 ` [PATCH 7/9] x86/lbr: " Mark Rutland
2019-08-14 10:41 ` [PATCH 8/9] x86/fpu: " Mark Rutland
2019-08-14 13:07 ` Sebastian Andrzej Siewior
2019-08-14 13:39 ` Mark Rutland
2019-08-14 14:55 ` Sebastian Andrzej Siewior
2019-08-14 10:41 ` [PATCH 9/9] samples/kretprobe: " Mark Rutland
2019-08-14 13:43 ` [PATCH 0/9] kthread detection cleanup Valentin Schneider
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