[PATCH v2] ARM: mm: Do not invoke OOM for higher order IOMMU DMA allocations

[David Rientjes]

On Mon, 23 Mar 2015, Tomasz Figa wrote:

> IOMMU should be able to use single pages as well as bigger blocks, so if
> higher order allocations fail, we should not affect state of the system,
> with events such as OOM killer, but rather fall back to order 0
> allocations.
> 
> This patch changes the behavior of ARM IOMMU DMA allocator to use
> __GFP_NORETRY, which bypasses OOM invocation, for orders higher than
> zero and, only if that fails, fall back to normal order 0 allocation
> which might invoke OOM killer.
> 
> Signed-off-by: Tomasz Figa <tfiga at chromium.org>

Acked-by: David Rientjes <rientjes at google.com>