[S390] Use alternative user-copy operations for new hardware.

This introduces new user-copy operations which are optimized for
copying more than 256 Bytes on new hardware.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index e229af59976c..e3d9325f6022 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -647,7 +647,11 @@ setup_arch(char **cmdline_p)
 
         memory_end = memory_size;
 
-        memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
+        if (MACHINE_HAS_MVCOS)
+                memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
+        else
+                memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
+
         parse_early_param();
 
 #ifndef CONFIG_64BIT