ARC: mm: Use virt_to_pfn() for addr >> PAGE_SHIFT pattern

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/include/asm/page.h

@@ -10,7 +10,6 @@
 
 #include <uapi/asm/page.h>
 
-
 #ifndef __ASSEMBLY__
 
 #define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)
@@ -76,7 +75,9 @@ typedef unsigned long pgprot_t;
 
 typedef pte_t * pgtable_t;
 
-#define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
+#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
+
+#define ARCH_PFN_OFFSET		virt_to_pfn(CONFIG_LINUX_LINK_BASE)
 
 #define pfn_valid(pfn)		(((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 
@@ -85,21 +86,15 @@ typedef pte_t * pgtable_t;
  *
  * These macros have historically been misnamed
  * virt here means link-address/program-address as embedded in object code.
- * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
- * 128th page, and virt_to_page( ) will return the struct page corresp to it.
- * mem_map[ ] is an array of struct page for each page frame in the system
- *
- * Independent of where linux is linked at, link-addr = physical address
- * So the old macro  __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
- * would have been wrong in case kernel is not at 0x8zs
+ * And for ARC, link-addr = physical address
  */
 #define __pa(vaddr)  ((unsigned long)vaddr)
 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
 
 #define virt_to_page(kaddr)	\
-	(mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
+	(mem_map + virt_to_pfn((kaddr) - CONFIG_LINUX_LINK_BASE))
 
-#define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 
 /* Default Permissions for stack/heaps pages (Non Executable) */
 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)

arch/arc/include/asm/pgtable.h

@@ -278,15 +278,14 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 #define pmd_present(x)			(pmd_val(x))
 #define pmd_clear(xp)			do { pmd_val(*(xp)) = 0; } while (0)
 
-#define pte_page(x) (mem_map + \
-		(unsigned long)(((pte_val(x) - CONFIG_LINUX_LINK_BASE) >> \
-				PAGE_SHIFT)))
+#define pte_page(pte)	\
+	(mem_map + virt_to_pfn(pte_val(pte) - CONFIG_LINUX_LINK_BASE))
 
 #define mk_pte(page, prot)	pfn_pte(page_to_pfn(page), prot)
-#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
+#define pte_pfn(pte)		virt_to_pfn(pte_val(pte))
 #define pfn_pte(pfn, prot)	(__pte(((pte_t)(pfn) << PAGE_SHIFT) | \
 				 pgprot_val(prot)))
-#define __pte_index(addr)	(((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define __pte_index(addr)	(virt_to_pfn(addr) & (PTRS_PER_PTE - 1))
 
 /*
  * pte_offset gets a @ptr to PMD entry (PGD in our 2-tier paging system)