[PATCH] x86_64: disallow multi-byte hardware execution breakpoints

While AMD formally permits multi-byte execution breakpoints, Intel
disallows 8-byte as much as 2- or 4-byte ones.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/ptrace.c

@@ -422,7 +422,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			 * this awkward check.*/
 			data &= ~DR_CONTROL_RESERVED;
 			for(i=0; i<4; i++)
-					  if ((0x5454 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
+				if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
 					break;
 			if (i == 4) {
 				child->thread.debugreg7 = data;