x86: provide a bad_dma_address symbol for i386

It's initially 0, since we don't expect any DMA there. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
git-mirror · Apr 19, 2008 · 7c18341 · 7c18341
1 parent b48ee71
commit 7c18341
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Showing 3 changed files with 6 additions and 1 deletion.
diff --git a/arch/x86/kernel/pci-dma_32.c b/arch/x86/kernel/pci-dma_32.c
@@ -14,6 +14,10 @@
 #include <linux/module.h>
 #include <asm/io.h>
 
+/* For i386, we make it point to the NULL address */
+dma_addr_t bad_dma_address __read_mostly = 0x0;
+EXPORT_SYMBOL(bad_dma_address);
+
 struct dma_coherent_mem {
 	void		*virt_base;
 	u32		device_base;

diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
@@ -10,6 +10,8 @@
 #include <asm/io.h>
 #include <asm/swiotlb.h>
 
+extern dma_addr_t bad_dma_address;
+
 struct dma_mapping_ops {
 	int             (*mapping_error)(dma_addr_t dma_addr);
 	void*           (*alloc_coherent)(struct device *dev, size_t size,

diff --git a/include/asm-x86/dma-mapping_64.h b/include/asm-x86/dma-mapping_64.h
@@ -1,7 +1,6 @@
 #ifndef _X8664_DMA_MAPPING_H
 #define _X8664_DMA_MAPPING_H 1
 
-extern dma_addr_t bad_dma_address;
 extern int iommu_merge;
 
 static inline int dma_mapping_error(dma_addr_t dma_addr)