The patch titled
Subject: mm/dmapool.c: align to ARCH_DMA_MINALIGN in non-coherent DMA mode
has been added to the -mm tree. Its filename is
mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode.patch
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------------------------------------------------------
From: Huacai Chen <chenhc@xxxxxxxxxx>
Subject: mm/dmapool.c: align to ARCH_DMA_MINALIGN in non-coherent DMA mode
In non-coherent DMA mode, kernel uses cache flushing operations to
maintain I/O coherency, so the dmapool objects should be aligned to
ARCH_DMA_MINALIGN.
Link: http://lkml.kernel.org/r/1505294451-21312-1-git-send-email-chenhc@xxxxxxxxxx
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Cc: Fuxin Zhang <zhangfx@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/dmapool.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/dmapool.c~mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode mm/dmapool.c
--- a/mm/dmapool.c~mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode
+++ a/mm/dmapool.c
@@ -140,6 +140,9 @@ struct dma_pool *dma_pool_create(const c
else if (align & (align - 1))
return NULL;
+ if (!plat_device_is_coherent(dev))
+ align = max_t(size_t, align, dma_get_cache_alignment());
+
if (size == 0)
return NULL;
else if (size < 4)
_
Patches currently in -mm which might be from chenhc@xxxxxxxxxx are
mm-dmapool-align-to-arch_dma_minalign-in-non-coherent-dma-mode.patch
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