linux-kernel - Re: [PATCH 2/5] kernel/dma: remove unnecessary unmap_kernel

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Date:   Wed, 27 Jan 2021 08:10:59 +0100
From:   Christoph Hellwig <hch@....de>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Nicholas Piggin <npiggin@...il.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 2/5] kernel/dma: remove unnecessary unmap_kernel_range

On Tue, Jan 26, 2021 at 05:08:46PM -0500, Konrad Rzeszutek Wilk wrote:
> On Tue, Jan 26, 2021 at 02:54:01PM +1000, Nicholas Piggin wrote:
> > vunmap will remove ptes.
> 
> Should there be some ASSERT after the vunmap to make sure that is the
> case? 

Not really.  removing the PTEs is the whole point of vunmap.  Everything
else is just house keeping.