s390 kprobes: Align probe address

[This patch applies to both linux and mm trees. Please send comments off list, thanks]

Running a probe on s390 with a probe address that is not 4 byte aligned results in a Kernel BUG. The problem is that the stura instruction used by swap_instruction requires the destination address to be 4 byte aligned. As stura only writes 4 bytes, aligning to the next 4 byte aligned address results in the breakpoint instruction being stored past the probe address. The fix is to align the address backward (to the previous 4 byte aligned address) and writing the two byte breakpoint instruction in the appropriate bytes.

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index 8af549e..993f353 100644
@@ -167,7 +167,7 @@ static int __kprobes swap_instruction(vo
 	 * shall not cross any page boundaries (vmalloc area!) when writing
 	 * the new instruction.
 	 */
-	addr = (u32 *)ALIGN((unsigned long)args->ptr, 4);
+	addr = (u32 *)((unsigned long)args->ptr & -4UL);
 	if ((unsigned long)args->ptr & 2)
 		instr = ((*addr) & 0xffff0000) | args->new;
 	else