Re: [PATCH 02/28] staging: android: ion: use vmap instead of vm_map_ram

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To: Christoph Hellwig <hch@xxxxxx>
Subject: Re: [PATCH 02/28] staging: android: ion: use vmap instead of vm_map_ram
From: Greg KH <greg@xxxxxxxxx>
Date: Wed, 8 Apr 2020 15:27:13 +0200
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, x86@xxxxxxxxxx, David Airlie <airlied@xxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxx>, Sumit Semwal <sumit.semwal@xxxxxxxxxx>, Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>, Minchan Kim <minchan@xxxxxxxxxx>, Nitin Gupta <ngupta@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linaro-mm-sig@xxxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20200408115926.1467567-3-hch@lst.de>
References: <20200408115926.1467567-1-hch@lst.de> <20200408115926.1467567-3-hch@lst.de>

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@xxxxxx>

Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

References:
- decruft the vmalloc API
  - From: Christoph Hellwig
- [PATCH 02/28] staging: android: ion: use vmap instead of vm_map_ram
  - From: Christoph Hellwig

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