1 files changed, 14 insertions, 0 deletions

diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c
index cb7c03e5cd21..8473b6bdf512 100644
--- a/arch/csky/mm/ioremap.c
+++ b/arch/csky/mm/ioremap.c
@@ -46,3 +46,17 @@ void iounmap(void __iomem *addr)
         vunmap((void *)((unsigned long)addr & PAGE_MASK));
 }
 EXPORT_SYMBOL(iounmap);
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+                              unsigned long size, pgprot_t vma_prot)
+{
+        if (!pfn_valid(pfn)) {
+                vma_prot.pgprot |= _PAGE_SO;
+                return pgprot_noncached(vma_prot);
+        } else if (file->f_flags & O_SYNC) {
+                return pgprot_noncached(vma_prot);
+        }
+
+        return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);