1 files changed, 17 insertions, 7 deletions

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 57870ab313c5..e750a938fd3c 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -18,6 +18,8 @@
 #include <linux/types.h>
 #include <linux/sizes.h>
 
+#include <asm/cache.h>
+
 #ifdef CONFIG_NEED_MACH_MEMORY_H
 #include <mach/memory.h>
 #endif
@@ -141,6 +143,20 @@
 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 
+/*
+ * Minimum guaranted alignment in pgd_alloc().  The page table pointers passed
+ * around in head.S and proc-*.S are shifted by this amount, in order to
+ * leave spare high bits for systems with physical address extension.  This
+ * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
+ * gives us about 38-bits or so.
+ */
+#ifdef CONFIG_ARM_LPAE
+#define ARCH_PGD_SHIFT          L1_CACHE_SHIFT
+#else
+#define ARCH_PGD_SHIFT          0
+#endif
+#define ARCH_PGD_MASK           ((1 << ARCH_PGD_SHIFT) - 1)
+
 #ifndef __ASSEMBLY__
 
 /*
@@ -207,7 +223,7 @@ static inline unsigned long __phys_to_virt(unsigned long x)
  * direct-mapped view.  We assume this is the first page
  * of RAM in the mem_map as well.
  */
-#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
+#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
 
 /*
  * These are *only* valid on the kernel direct mapped RAM memory.
@@ -260,12 +276,6 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
 /*
  * Conversion between a struct page and a physical address.
  *
- * Note: when converting an unknown physical address to a
- * struct page, the resulting pointer must be validated
- * using VALID_PAGE().  It must return an invalid struct page
- * for any physical address not corresponding to a system
- * RAM address.
- *
  *  page_to_pfn(page)   convert a struct page * to a PFN number
  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
  *