evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ARM: dma-mapping: use himem for DMA buffers for IOMMU-mapped devices

Browse source 
IOMMU can provide access to any memory page, so there is no point in
limiting the allocated pages only to lowmem, once other parts of
dma-mapping subsystem correctly supports himem pages.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Marek Szyprowski 2013-01-16 15:41:02 +01:00
parent 9848e48f4c
commit f8669bef11
1 changed files with 7 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
arch/arm/mm/dma-mapping.c
View file

@ -1095,12 +1095,17 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
return pages; return pages;
} }
/*
* IOMMU can map any pages, so himem can also be used here
*/
gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
while (count) { while (count) {
int j, order = __fls(count); int j, order = __fls(count);
pages[i] = alloc_pages(gfp | __GFP_NOWARN, order); pages[i] = alloc_pages(gfp, order);
while (!pages[i] && order) while (!pages[i] && order)
pages[i] = alloc_pages(gfp | __GFP_NOWARN, --order); pages[i] = alloc_pages(gfp, --order);
if (!pages[i]) if (!pages[i])
goto error; goto error;