ARM: 8337/1: mm: Do not invoke OOM for higher order IOMMU DMA allocations

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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@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Tomasz Figa 2015-04-01 07:26:33 +01:00 • committed by Russell King

parent 8defb3367f

commit 49f28aa6b0

1 changed files with 21 additions and 6 deletions

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arch/arm/mm/dma-mapping.c

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