linux-kernel - Re: [RFC PATCH] vfio: type1: fix kthread use case

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Message-ID: <83a37410-1740-1a50-9d2d-6ad7587b8532@web.de>
Date:   Mon, 6 Jul 2020 13:32:18 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Hillf Danton <hdanton@...a.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        iommu@...ts.linux-foundation.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Jörg Rödel <joro@...tes.org>,
        Kevin Tian <kevin.tian@...el.com>,
        Yan Zhao <yan.y.zhao@...el.com>
Subject: Re: [RFC PATCH] vfio: type1: fix kthread use case

…
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -2798,7 +2798,8 @@ static int vfio_iommu_type1_dma_rw_chunk
…
> -	bool kthread = current->mm == NULL;
> +	bool kthread = current->flags & PF_KTHREAD;
> +	bool use_mm = current->mm == NULL;
…

Can it be helpful to convert initialisations for these variables
into later assignments?

Regards,
Markus