[S390] fix s390 assembler code alignments

The alignment is missing for various global symbols in s390 assembly code.
With a recent gcc and an instruction like stgrl this can lead to a
specification exception if the instruction uses such a mis-aligned address.

Specify the alignment explicitely and while add it define __ALIGN for s390
and use the ENTRY define to save some lines of code.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/mcount.S

@@ -5,21 +5,19 @@
  *
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 
 	.section .kprobes.text, "ax"
 
-	.globl ftrace_stub
-ftrace_stub:
+ENTRY(ftrace_stub)
 	br	%r14
 
-	.globl _mcount
-_mcount:
+ENTRY(_mcount)
 #ifdef CONFIG_DYNAMIC_FTRACE
 	br	%r14
 
-	.globl ftrace_caller
-ftrace_caller:
+ENTRY(ftrace_caller)
 #endif
 	stm	%r2,%r5,16(%r15)
 	bras	%r1,2f
@@ -41,8 +39,7 @@ ftrace_caller:
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	l	%r2,100(%r15)
 	l	%r3,152(%r15)
-	.globl	ftrace_graph_caller
-ftrace_graph_caller:
+ENTRY(ftrace_graph_caller)
 # The bras instruction gets runtime patched to call prepare_ftrace_return.
 # See ftrace_enable_ftrace_graph_caller. The patched instruction is:
 #	bras	%r14,prepare_ftrace_return
@@ -56,8 +53,7 @@ ftrace_graph_caller:
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
-	.globl	return_to_handler
-return_to_handler:
+ENTRY(return_to_handler)
 	stm	%r2,%r5,16(%r15)
 	st	%r14,56(%r15)
 	lr	%r0,%r15