Commit 49f28aa6 authored Apr 01, 2015 by Tomasz Figa Committed by Russell King Apr 02, 2015

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



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>

parent 8defb336

arch/arm/mm/dma-mapping.c

+21 −6

Original line number	Diff line number	Diff line
		@@ -1135,13 +1135,28 @@ static struct page *__iommu_alloc_buffer(struct device dev, size_t size,
		gfp \|= __GFP_NOWARN \| __GFP_HIGHMEM;

		while (count) {
		int j, order = __fls(count);
		int j, order;

		pages[i] = alloc_pages(gfp, order);
		while (!pages[i] && order)
		pages[i] = alloc_pages(gfp, --order);
		for (order = __fls(count); order > 0; --order) {
		/*
		* We do not want OOM killer to be invoked as long
		* as we can fall back to single pages, so we force
		* __GFP_NORETRY for orders higher than zero.
		*/
		pages[i] = alloc_pages(gfp \| __GFP_NORETRY, order);
		if (pages[i])
		break;
		}

		if (!pages[i]) {
		/*
		* Fall back to single page allocation.
		* Might invoke OOM killer as last resort.
		*/
		pages[i] = alloc_pages(gfp, 0);
		if (!pages[i])
		goto error;
		}

		if (order) {
		split_page(pages[i], order);