s390/mm: convert to the generic get_user_pages_fast code

[sfrench/cifs-2.6.git] / arch / s390 / include / asm / pgtable.h

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index d48be9c27df92bf7916693657bc58000d06a0a76..394bec31cb97d929b3fd3d1cedbb02c7e64797d1 100644 (file)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1265,6 +1265,18 @@ static inline pte_t *pte_offset(pmd_t *pmd, unsigned long address)
 #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
 #define pte_unmap(pte) do { } while (0)
 
+static inline bool gup_fast_permitted(unsigned long start, int nr_pages)
+{
+       unsigned long len, end;
+
+       len = (unsigned long) nr_pages << PAGE_SHIFT;
+       end = start + len;
+       if (end < start)
+               return false;
+       return end <= current->mm->context.asce_limit;
+}
+#define gup_fast_permitted gup_fast_permitted
+
 #define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot))
 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
 #define pte_page(x) pfn_to_page(pte_pfn(x))