linux-kernel - Re: [PATCH] dma_declare_coherent

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Date:	Mon, 23 Apr 2007 00:49:43 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	James Bottomley <James.Bottomley@...elEye.com>
cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Mikael Starvik <starvik@...s.com>
Subject: Re: [PATCH] dma_declare_coherent_memory wrong allocation

On Mon, 23 Apr 2007, Guennadi Liakhovetski wrote:

> to also allow for size not an integer number of pages as Andrew noticed? 
> This could be done in 2 patches:

patch 2:

---
Fix bitmap allocation and size non-multiple of PAGE_SIZE in 
dma_declare_coherent_memory implementations. i386 compile-tested.

Signed-off-by: G. Liakhovetski <g.liakhovetski@....de>

diff --git a/arch/i386/kernel/pci-dma.c b/arch/i386/kernel/pci-dma.c
index 3ebcea0..0a9317a 100644
--- a/arch/i386/kernel/pci-dma.c
+++ b/arch/i386/kernel/pci-dma.c
@@ -76,8 +76,8 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 				dma_addr_t device_addr, size_t size, int flags)
 {
 	void __iomem *mem_base = NULL;
-	int pages = size >> PAGE_SHIFT;
-	int bitmap_size = (pages + 31)/32;
+	int pages = DIV_ROUND_UP(size, PAGE_SIZE);
+	int bitmap_size = BITS_TO_LONGS(pages) * BYTES_PER_LONG;
 
 	if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
 		goto out;
diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c
index d634347..99f760e 100644
--- a/arch/cris/arch-v32/drivers/pci/dma.c
+++ b/arch/cris/arch-v32/drivers/pci/dma.c
@@ -75,8 +75,8 @@ int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
 				dma_addr_t device_addr, size_t size, int flags)
 {
 	void __iomem *mem_base;
-	int pages = size >> PAGE_SHIFT;
-	int bitmap_size = (pages + 31)/32;
+	int pages = DIV_ROUND_UP(size, PAGE_SIZE);
+	int bitmap_size = BITS_TO_LONGS(pages) * BYTES_PER_LONG;
 
 	if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
 		goto out;
-
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