[PATCH] page_to_phys() fix for >4GB pages (i386)

[Badari Pulavarty]

Hi,

I found that page_to_phys() is broken for pages > 4GB on x86.
It is truncating the physical addresses to 32bit, loosing higher
bits. (pci_map_sg() uses this).

Here is the patch to fix it. Marcelo, could you consider this
patch ? I have not looked at 2.5 yet, it may be needed there also.

Thanks,
Badari

--- linux/include/asm-i386/io.h Fri Mar 15 11:19:28 2002
+++ linux.new/include/asm-i386/io.h     Fri Mar 15 11:20:38 2002
@@ -76,7 +76,11 @@
 /*
  * Change "struct page" to physical address.
  */
+#ifdef CONFIG_HIGHMEM64G
+#define page_to_phys(page)     ((u64)(page - mem_map) << PAGE_SHIFT)
+#else
 #define page_to_phys(page)     ((page - mem_map) << PAGE_SHIFT)
+#endif

 extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);