Revert 2.6.31's temporary "/proc/kcore: work around a BUG()" to make way

for the permanent fix for that bug.

Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Nick Craig-Wood <nick@craig-wood.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: <kbowa@tuxedu.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/proc/kcore.c

@@ -361,13 +361,7 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
 				/* don't dump ioremap'd stuff! (TA) */
 				if (m->flags & VM_IOREMAP)
 					continue;
-				/*
-				 * we may access memory holes, then use
-				 * ex_table. checking return value just for
-				 * avoid warnings.
-				 */
-				vmsize = __copy_from_user_inatomic(
-					elf_buf + (vmstart - start),
+				memcpy(elf_buf + (vmstart - start),
 					(char *)vmstart, vmsize);
 			}
 			read_unlock(&vmlist_lock);