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Date: Wed, 8 Apr 2020 15:27:13 +0200
From: Greg KH <greg@kroah.com>
Subject: Re: [PATCH 02/28] staging: android: ion: use vmap instead of
 vm_map_ram
Message-ID: <20200408132713.GA1248058@kroah.com>
References: <20200408115926.1467567-1-hch@lst.de>
 <20200408115926.1467567-3-hch@lst.de>
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In-Reply-To: <20200408115926.1467567-3-hch@lst.de>
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List-ID: <linux-s390.vger.kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>, "K. Y. Srinivasan" <kys@microsoft.com>, Haiyang Zhang <haiyangz@microsoft.com>, Stephen Hemminger <sthemmin@microsoft.com>, Wei Liu <wei.liu@kernel.org>, x86@kernel.org, David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>, Laura Abbott <labbott@redhat.com>, Sumit Semwal <sumit.semwal@linaro.org>, Sakari Ailus <sakari.ailus@linux.intel.com>, Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>, Robin Murphy <robin.murphy@arm.com>, Christophe Leroy <christophe.leroy@c-s.fr>, Peter Zijlstra <peterz@infradead.org>, linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org

On Wed, Apr 08, 2020 at 01:59:00PM +0200, Christoph Hellwig wrote:
> vm_map_ram can keep mappings around after the vm_unmap_ram.  Using that
> with non-PAGE_KERNEL mappings can lead to all kinds of aliasing issues.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>