Re: [PATCH 3.2] IB/qib: Change lkey table allocation to support more MRs

[Ben Hutchings <ben@decadent.org.uk>]

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On Tue, 2015-09-29 at 10:51 -0400, Mike Marciniszyn wrote:
> The lkey table is allocated with with a get_user_pages() with an
> order based on a number of index bits from a module parameter.
> 
> The underlying kernel code cannot allocate that many contiguous
> pages.
> 
> There is no reason the underlying memory needs to be physically
> contiguous.
> 
> This patch:
> - switches the allocation/deallocation to vmalloc/vfree
> - caps the number of bits to 23 to insure at least 1 generation bit
>   o this matches the module parameter description
> 
> Cc: stable@vger.kernel.org # 3.2
> Reviewed-by: Vinit Agnihotri <vinit.abhay.agnihotri@intel.com>
> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
> Signed-off-by: Doug Ledford <dledford@redhat.com>
[...]

qib_dev_warn() is not defined.  But, I worked out how to backport this
anyway.

Ben.


-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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