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Subject[PATCH 3.16.y-ckt 080/126] drivers: of: of_reserved_mem: fixup the alignment with CMA setup
3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.


From: Jason Liu <>

commit 1cc8e3458b5110253c8f5aaf1890d5ffea9bb7b7 upstream.

There is an alignment mismatch issue between the of_reserved_mem and
the CMA setup requirement. The of_reserved_mem will try to get the
alignment value from the DTS and pass it to __memblock_alloc_base to
do the memory block base allocation, but the alignment value specified
in the DTS may not satisfy the CAM setup requirement since CMA setup
required the alignment as the following in the code:

align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);

The sanity check in the function of rmem_cma_setup will fail if the
alignment does not setup correctly and thus CMA will fail to setup.

This patch is to fixup the alignment to meet the CMA setup required.

Signed-off-by: Jason Liu <>
Acked-by: Marek Szyprowski <>
Cc: Grant Likely <>
Cc: Rob Herring <>
Signed-off-by: Rob Herring <>
Signed-off-by: Luis Henriques <>
drivers/of/of_reserved_mem.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 632aae861375..86f284f0960e 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -123,6 +123,10 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
align = dt_mem_next_cell(dt_root_addr_cells, &prop);

+ /* Need adjust the alignment to satisfy the CMA requirement */
+ if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
+ align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
if (prop) {

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