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@@ -73,8 +73,8 @@ extern unsigned long memory_end;
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#ifndef __ASSEMBLY__
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-#define __pa(vaddr) virt_to_phys((void *)vaddr)
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-#define __va(paddr) phys_to_virt((unsigned long)paddr)
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+#define __pa(vaddr) virt_to_phys((void *)(vaddr))
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+#define __va(paddr) phys_to_virt((unsigned long)(paddr))
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#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
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@@ -84,6 +84,7 @@ extern unsigned long memory_end;
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#define pfn_to_page(pfn) virt_to_page(pfn_to_virt(pfn))
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#define page_to_pfn(page) virt_to_pfn(page_to_virt(page))
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+#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
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((void *)(kaddr) < (void *)memory_end))
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