s390/mm: add missing pfn_to_kaddr helper

kasan common code uses pfn_to_kaddr, which is defined by many other
architectures. Adding it as well to avoid a build error.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.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 41e3908..a4d3809 100644 (file)
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -161,6 +161,7 @@ static inline int devmem_is_allowed(unsigned long pfn)
 
 #define virt_to_pfn(kaddr)     (__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_virt(pfn)       __va((pfn) << PAGE_SHIFT)
+#define pfn_to_kaddr(pfn)      pfn_to_virt(pfn)
 
 #define virt_to_page(kaddr)    pfn_to_page(virt_to_pfn(kaddr))
 #define page_to_virt(page)     pfn_to_virt(page_to_pfn(page))