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From: Markus Elfring <Markus.Elfring@web.de>
To: Hillf Danton <hdanton@sina.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	iommu@lists.linux-foundation.org
Cc: Kevin Tian <kevin.tian@intel.com>,
	Yan Zhao <yan.y.zhao@intel.com>,
	kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [RFC PATCH] vfio: type1: fix kthread use case
Date: Mon, 6 Jul 2020 15:33:58 +0200	[thread overview]
Message-ID: <7ed25c44-bb51-2d8d-82d9-f11272f56424@web.de> (raw)
In-Reply-To: <20200706124241.4392-1-hdanton@sina.com>

>> Can it be helpful to convert initialisations for these variables
>> into later assignments?
>
> Perhaps. Then it looks like the below.
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -2798,9 +2798,12 @@ static int vfio_iommu_type1_dma_rw_chunk
> -	bool kthread = current->mm == NULL;
> +	bool kthread;
> +	bool use_mm;

I would prefer the following variable declarations then.

+	bool kthread, use_mm;


>  	size_t offset;
>
> +	kthread = current->flags & PF_KTHREAD;
> +	use_mm = current->mm == NULL;

I propose to move such assignments directly before the corresponding check.


…
>  	if (!mm)
>  		return -EPERM;


+	kthread = current->flags & PF_KTHREAD;
+	use_mm = !current->mm;

> -	if (kthread)
> +	if (kthread && use_mm)
>  		kthread_use_mm(mm);
…

Regards,
Markus
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  reply	other threads:[~2020-07-06 13:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-06 10:49 Hillf Danton
2020-07-06 11:32 ` Markus Elfring
2020-07-06 12:42   ` Hillf Danton
2020-07-06 13:33     ` Markus Elfring [this message]
2020-07-06 14:08       ` Hillf Danton
2020-07-06 14:04     ` Markus Elfring
2020-07-07  1:14       ` Hillf Danton
2020-07-07  6:04         ` Markus Elfring
2020-07-07  0:31 ` Yan Zhao
2020-07-07  2:00   ` Hillf Danton

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