This is a note to let you know that I've just added the patch titled
arm64: Honor __GFP_ZERO in dma allocations
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-honor-__gfp_zero-in-dma-allocations.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 7132813c384515c9dede1ae20e56f3895feb7f1e Mon Sep 17 00:00:00 2001
From: "Suzuki K. Poulose" <[email protected]>
Date: Thu, 19 Mar 2015 18:17:09 +0000
Subject: arm64: Honor __GFP_ZERO in dma allocations
From: "Suzuki K. Poulose" <[email protected]>
commit 7132813c384515c9dede1ae20e56f3895feb7f1e upstream.
Current implementation doesn't zero out the pages allocated.
Honor the __GFP_ZERO flag and zero out if set.
Cc: <[email protected]> # v3.14+
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Suzuki K. Poulose <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm64/mm/dma-mapping.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -44,6 +44,7 @@ static void *arm64_swiotlb_alloc_coheren
flags |= GFP_DMA32;
if (IS_ENABLED(CONFIG_DMA_CMA)) {
struct page *page;
+ void *addr;
size = PAGE_ALIGN(size);
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
@@ -52,7 +53,10 @@ static void *arm64_swiotlb_alloc_coheren
return NULL;
*dma_handle = phys_to_dma(dev, page_to_phys(page));
- return page_address(page);
+ addr = page_address(page);
+ if (flags & __GFP_ZERO)
+ memset(addr, 0, size);
+ return addr;
} else {
return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/arm64-honor-__gfp_zero-in-dma-allocations.patch
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