powerpc/mm: Add virt_to_pfn and use this instead of opencoding

This add helper virt_to_pfn and remove the opencoded usage of the
same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 71294a6..168ca67 100644 (file)
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -127,9 +127,10 @@ extern long long virt_phys_offset;
 #define pfn_valid(pfn)         ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
 #endif
 
-#define virt_to_page(kaddr)    pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_to_pfn(kaddr)     (__pa(kaddr) >> PAGE_SHIFT)
+#define virt_to_page(kaddr)    pfn_to_page(virt_to_pfn(kaddr))
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
-#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
 
 /*
  * On Book-E parts we need __va to parse the device tree and we can't