s390/mm: add missing virt_to_pfn() etc. helper functions

Add all the missing little helper functions like virt_to_pfn(),
phys_to_page(), etc.  While we had a couple of these helper functions
like e.g. page_to_phys() the other functions were missing, which is
quite annoying if one is looking for exactly such a function.

Therefore finally add all those little helper functions.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index c68b21b..5d5c2b3 100644 (file)
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -152,16 +152,26 @@ static inline int devmem_is_allowed(unsigned long pfn)
 
 #endif /* !__ASSEMBLY__ */
 
-#define __PAGE_OFFSET           0x0UL
-#define PAGE_OFFSET             0x0UL
-#define __pa(x)                 (unsigned long)(x)
-#define __va(x)                 (void *)(unsigned long)(x)
-#define virt_to_page(kaddr)    pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
-#define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
-#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+#define __PAGE_OFFSET          0x0UL
+#define PAGE_OFFSET            0x0UL
+
+#define __pa(x)                        ((unsigned long)(x))
+#define __va(x)                        ((void *)(unsigned long)(x))
+
+#define virt_to_pfn(kaddr)     (__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_virt(pfn)       __va((pfn) << PAGE_SHIFT)
+
+#define virt_to_page(kaddr)    pfn_to_page(virt_to_pfn(kaddr))
 #define page_to_virt(page)     pfn_to_virt(page_to_pfn(page))
 
+#define phys_to_pfn(kaddr)     ((kaddr) >> PAGE_SHIFT)
+#define pfn_to_phys(pfn)       ((pfn) << PAGE_SHIFT)
+
+#define phys_to_page(kaddr)    pfn_to_page(phys_to_pfn(kaddr))
+#define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
+
+#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+
 #define VM_DATA_DEFAULT_FLAGS  (VM_READ | VM_WRITE | \
                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)