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authorChristoph Hellwig <hch@lst.de>2019-08-20 11:45:49 +0900
committerChristoph Hellwig <hch@lst.de>2019-08-21 07:14:10 +0900
commit90ae409f9eb3bcaf38688f9ec22375816053a08e (patch)
tree9ab3713cac2e657fc87fa8108a9dfa2b67f4d439 /include/linux/dma-contiguous.h
parent936376f88ff1845b384b3a82b9cd167e53039229 (diff)
downloadlinux-90ae409f9eb3bcaf38688f9ec22375816053a08e.tar.gz
dma-direct: fix zone selection after an unaddressable CMA allocation
The new dma_alloc_contiguous hides if we allocate CMA or regular pages, and thus fails to retry a ZONE_NORMAL allocation if the CMA allocation succeeds but isn't addressable. That means we either fail outright or dip into a small zone that might not succeed either. Thanks to Hillf Danton for debugging this issue. Fixes: b1d2dc009dec ("dma-contiguous: add dma_{alloc,free}_contiguous() helpers") Reported-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Diffstat (limited to 'include/linux/dma-contiguous.h')
-rw-r--r--include/linux/dma-contiguous.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-contiguous.h
index c05d4e661489..03f8e98e3bcc 100644
--- a/include/linux/dma-contiguous.h
+++ b/include/linux/dma-contiguous.h
@@ -160,10 +160,7 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages,
static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
gfp_t gfp)
{
- int node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
- size_t align = get_order(PAGE_ALIGN(size));
-
- return alloc_pages_node(node, gfp, align);
+ return NULL;
}
static inline void dma_free_contiguous(struct device *dev, struct page *page,