From: Haggai Eran <haggaie@mellanox.com>
Date: Thu, 11 Dec 2014 15:04:22 +0000 (+0200)
Subject: IB/mlx5: Add mlx5_ib_update_mtt to update page tables after creation
X-Git-Tag: omap-for-v3.19/fixes-rc1~37^2^7~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=832a6b06ab5e13c228fc27e333ad360aa03ace6f;p=pandora-kernel.git

IB/mlx5: Add mlx5_ib_update_mtt to update page tables after creation

The new function allows updating the page tables of a memory region
after it was created. This can be used to handle page faults and page
invalidations.

Since mlx5_ib_update_mtt will need to work from within page invalidation,
so it must not block on memory allocation. It employs an atomic memory
allocation mechanism that is used as a fallback when kmalloc(GFP_ATOMIC) fails.

In order to reuse code from mlx5_ib_populate_pas, the patch splits
this function and add the needed parameters.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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