Subject: privcmd: mmapbatch-v2 fixes

- clear error indication array when no error encountered
- no need to copy back mfn array in comapt mode shim

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/drivers/xen/privcmd/compat_privcmd.c
+++ b/drivers/xen/privcmd/compat_privcmd.c
@@ -102,7 +102,7 @@ int privcmd_ioctl_32(int fd, unsigned in
 		struct privcmd_mmapbatch_v2_32 n32;
 #ifdef xen_pfn32_t
 		xen_pfn_t *__user arr;
-		xen_pfn32_t *__user arr32;
+		const xen_pfn32_t *__user arr32;
 		unsigned int i;
 #endif
 
@@ -133,17 +133,6 @@ int privcmd_ioctl_32(int fd, unsigned in
 #endif
 
 		ret = sys_ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH_V2, (unsigned long)p);
-
-#ifdef xen_pfn32_t
-		for (i = 0; !ret && i < n32.num; ++i) {
-			xen_pfn_t mfn;
-
-			if (get_user(mfn, arr + i) || put_user(mfn, arr32 + i))
-				ret = -EFAULT;
-			else if (mfn != (xen_pfn32_t)mfn)
-				ret = -ERANGE;
-		}
-#endif
 	}
 		break;
 	default:
--- sle11sp1-2010-01-20.orig/drivers/xen/privcmd/privcmd.c	2010-01-19 10:33:58.000000000 +0100
+++ sle11sp1-2010-01-20/drivers/xen/privcmd/privcmd.c	2010-01-21 12:21:44.000000000 +0100
@@ -389,7 +389,8 @@ static long privcmd_ioctl(struct file *f
 					ret = -EFAULT;
 				i += nr; p += nr;
 			}
-		}
+		} else if (clear_user(m.err, nr_pages * sizeof(*m.err)))
+			ret = -EFAULT;
 
 	mmapbatch_v2_out:
 		list_for_each_safe(l, l2, &pagelist)