@@ -55,6 +55,7 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
flags |= GFP_DMA;
if (IS_ENABLED(CONFIG_DMA_CMA)) {
struct page *page;
+ void *addr;
size = PAGE_ALIGN(size);
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
@@ -63,7 +64,10 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
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);
}
This is a note to let you know that I have just added a patch titled arm64: Honor __GFP_ZERO in dma allocations to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.16.y-queue This patch is scheduled to be released in version 3.16.7-ckt10. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.16.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 0dc78f85211105a1bdde5dac45e83dd373b5a50b Mon Sep 17 00:00:00 2001 From: "Suzuki K. Poulose" <suzuki.poulose@arm.com> Date: Thu, 19 Mar 2015 18:17:09 +0000 Subject: arm64: Honor __GFP_ZERO in dma allocations commit 7132813c384515c9dede1ae20e56f3895feb7f1e upstream. Current implementation doesn't zero out the pages allocated. Honor the __GFP_ZERO flag and zero out if set. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> [ luis: backported to 3.16: based on Suzuki's 3.14 backport ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- arch/arm64/mm/dma-mapping.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)