[S390] Add real memory access functions

Add access function for real memory needed by s390 kdump backend.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 18 deletions

diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 3b94044027c2..f4f1da213e28 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -142,22 +142,6 @@ static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
         return memcpy_hsa(dest, src, count, TO_KERNEL);
 }
 
-static int memcpy_real_user(void __user *dest, unsigned long src, size_t count)
-{
-        static char buf[4096];
-        int offs = 0, size;
-
-        while (offs < count) {
-                size = min(sizeof(buf), count - offs);
-                if (memcpy_real(buf, (void *) src + offs, size))
-                        return -EFAULT;
-                if (copy_to_user(dest + offs, buf, size))
-                        return -EFAULT;
-                offs += size;
-        }
-        return 0;
-}
-
 static int __init init_cpu_info(enum arch_id arch)
 {
         struct save_area *sa;
@@ -346,8 +330,8 @@ static ssize_t zcore_read(struct file *file, char __user *buf, size_t count,
 
         /* Copy from real mem */
         size = count - mem_offs - hdr_count;
-        rc = memcpy_real_user(buf + hdr_count + mem_offs, mem_start + mem_offs,
-                              size);
+        rc = copy_to_user_real(buf + hdr_count + mem_offs,
+                               (void *) mem_start + mem_offs, size);
         if (rc)
                 goto fail;