linux-kernel - [PATCH 24/28] x86: unify gfp masks

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Date:	Tue,  8 Apr 2008 13:21:06 -0300
From:	Glauber Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, glommer@...il.com, mingo@...e.hu,
	tglx@...utronix.de, kvm-devel@...ts.sourceforge.net,
	amit.shah@...ranet.com, avi@...ranet.com,
	Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 24/28] x86: unify gfp masks

Use the same gfp masks for x86_64 and i386.
It involves using HIGHMEM or DMA32 where necessary, for the sake
of code compatibility, (no real effect), and using the NORETRY
mask for i386.

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/pci-dma_32.c |    6 ++++--
 arch/x86/kernel/pci-dma_64.c |    2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c
index 11f100a..5450bd1 100644
--- a/arch/x86/kernel/pci-dma_32.c
+++ b/arch/x86/kernel/pci-dma_32.c
@@ -79,7 +79,7 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 	unsigned long dma_mask = 0;
 
 	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 
 	if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &ret))
 		return ret;
@@ -91,7 +91,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 	if (dma_mask == 0)
 		dma_mask = DMA_32BIT_MASK;
 
- again:
+	/* Don't invoke OOM killer */
+	gfp |= __GFP_NORETRY;
+again:
 	page = dma_alloc_pages(dev, gfp, order);
 	if (page == NULL)
 		return NULL;
diff --git a/arch/x86/kernel/pci-dma_64.c b/arch/x86/kernel/pci-dma_64.c
index 13a31a4..b956f59 100644
--- a/arch/x86/kernel/pci-dma_64.c
+++ b/arch/x86/kernel/pci-dma_64.c
@@ -49,6 +49,8 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	unsigned long dma_mask = 0;
 	u64 bus;
 
+	/* ignore region specifiers */
+	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 
 	if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &memory))
 		return memory;
-- 
1.5.0.6

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