Subject: + x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch added to -mm tree
To: akinobu.mita@xxxxxxxxx,andi@xxxxxxxxxxxxxx,ddutile@xxxxxxxxxx,dwmw2@xxxxxxxxxxxxx,hpa@xxxxxxxxx,konrad.wilk@xxxxxxxxxx,m.szyprowski@xxxxxxxxxxx,mingo@xxxxxxxxxx,tglx@xxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 21 Apr 2014 14:10:35 -0700
The patch titled
Subject: arch/x86/kernel/pci-dma.c: avoid duplicated memset in dma_generic_alloc_coherent()
has been added to the -mm tree. Its filename is
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch
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------------------------------------------------------
From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Subject: arch/x86/kernel/pci-dma.c: avoid duplicated memset in dma_generic_alloc_coherent()
Fix a duplicated memset that was introduced by the patch
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled.patch
in -mm tree, and this change should be folded into it.
If dma_generic_alloc_coherent() is called with __GFP_ZERO, it does a
duplicated memset to the memory area allocated by alloc_pages_node() with
__GFP_ZERO. This change fixes that inefficiency by clearing __GFP_ZERO
bit in gfp flages before calling alloc_pages_node(). Note that
dma_generic_alloc_coherent() always returns zeroed memory.
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Don Dutile <ddutile@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/pci-dma.c | 1 +
1 file changed, 1 insertion(+)
diff -puN arch/x86/kernel/pci-dma.c~x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix arch/x86/kernel/pci-dma.c
--- a/arch/x86/kernel/pci-dma.c~x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix
+++ a/arch/x86/kernel/pci-dma.c
@@ -97,6 +97,7 @@ void *dma_generic_alloc_coherent(struct
dma_mask = dma_alloc_coherent_mask(dev, flag);
+ flag &= ~__GFP_ZERO;
again:
page = NULL;
/* CMA can be used only in the context which permits sleeping */
_
Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled.patch
x86-make-dma_alloc_coherent-return-zeroed-memory-if-cma-is-enabled-fix.patch
x86-enable-dma-cma-with-swiotlb.patch
intel-iommu-integrate-dma-cma.patch
memblock-introduce-memblock_alloc_range.patch
cma-add-placement-specifier-for-cma=-kernel-parameter.patch
arch-x86-kernel-pci-dmac-fix-dma_generic_alloc_coherent-when-config_dma_cma-is-enabled.patch
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