From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Fri, 22 Jul 2011 16:46:43 +0000 (-0400)
Subject: xen-swiotlb: Retry up three times to allocate Xen-SWIOTLB
X-Git-Tag: v3.2-rc1~192^4~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f4b2f07b2ed9b469ead87e06fc2fc3d12663a725;p=pandora-kernel.git

xen-swiotlb: Retry up three times to allocate Xen-SWIOTLB

We can fail seting up Xen-SWIOTLB if:
 - The host does not have enough contiguous DMA32 memory available
   (can happen on a machine that has fragmented memory from starting,
   stopping many guests).
 - Not enough low memory (almost never happens).

We retry allocating and exchanging the swath of contiguous memory
up to three times. Each time we decrease the amount we need  - the
minimum being of 2MB.

If we compleltly fail, we will print the reason for failure on the Xen
console on top of doing it to earlyprintk=xen console.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---

Reading git-diff-tree failed