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[RFC] drivers: dma-coherent: Change order of allocation to PAGE_SIZE

Message ID 1436419045-21407-1-git-send-email-sricharan@codeaurora.org (mailing list archive)
State Not Applicable, archived
Delegated to: Andy Gross
Headers show

Commit Message

Sricharan Ramabadhran July 9, 2015, 5:17 a.m. UTC
dma_alloc_from_coherent uses get_order(size) which makes carve-out
allocations not aligned on order boundaries to fail even though
they are page aligned. So wanted to know why is it required to have
the size aligned on order boundary. Changing it to get_order(PAGE_SIZE)
makes the non aligned carve-out allocations to go through.

Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
 drivers/base/dma-coherent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 55b8398..72bdc6f 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -156,7 +156,7 @@  int dma_alloc_from_coherent(struct device *dev, ssize_t size,
 				       dma_addr_t *dma_handle, void **ret)
 {
 	struct dma_coherent_mem *mem;
-	int order = get_order(size);
+	int order = get_order(PAGE_SIZE);
 	unsigned long flags;
 	int pageno;