Re: [PATCH char-misc-next 10/19] lib: convert iova.c into a library

[Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>]

On 28/07/15 11:03, Joerg Roedel wrote:
> On Mon, Jul 27, 2015 at 04:57:32PM -0700, Ashutosh Dixit wrote:
>> From: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>>
>> This patch converts iova.c into a library, moving it from
>> drivers/iommu/ to lib/, and exports its virtual address allocation and
>> management functions so that other modules can reuse them.
>>
>> Cc: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
>> Reviewed-by: Anil S Keshavamurthy <anil.s.keshavamurthy-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>> Reviewed-by: Sudeep Dutt <sudeep.dutt-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>> Signed-off-by: Harish Chegondi <harish.chegondi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
>
> Where is this going to be used outside of the IOMMU world?
>

...and how does it relate to the patches from Sakari (+CC) doing much 
the same thing[1]?

Having gone and fished out the main LKML thread ([2], to help anyone 
else missing it), I don't see any obvious dependency on the Intel IOMMU 
driver - what happens here if that is compiled out and hasn't called 
iommu_iova_cache_init() first?

Robin.

[1]:http://thread.gmane.org/gmane.linux.kernel.iommu/10142
[2]:http://thread.gmane.org/gmane.linux.kernel/2005895