[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/boot/compressed/head31.S

@@ -7,14 +7,14 @@
  */
 
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
 #include "sizes.h"
 
 __HEAD
-	.globl	startup_continue
-startup_continue:
+ENTRY(startup_continue)
 	basr	%r13,0			# get base
 .LPG1:
 	# setup stack

arch/s390/boot/compressed/head64.S

@@ -7,14 +7,14 @@
  */
 
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
 #include "sizes.h"
 
 __HEAD
-	.globl	startup_continue
-startup_continue:
+ENTRY(startup_continue)
 	basr	%r13,0			# get base
 .LPG1:
 	# setup stack

arch/s390/include/asm/linkage.h

 #ifndef __ASM_LINKAGE_H
 #define __ASM_LINKAGE_H
 
-/* Nothing to see here... */
+#include <linux/stringify.h>
+
+#define __ALIGN .align 4, 0x07
+#define __ALIGN_STR __stringify(__ALIGN)
 
 #endif

arch/s390/kernel/base.S

@@ -6,13 +6,13 @@
  *		 Michael Holzheu <holzheu@de.ibm.com>
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/ptrace.h>
 
 #ifdef CONFIG_64BIT
 
-	.globl	s390_base_mcck_handler
-s390_base_mcck_handler:
+ENTRY(s390_base_mcck_handler)
 	basr	%r13,0
 0:	lg	%r15,__LC_PANIC_STACK	# load panic stack
 	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -26,13 +26,13 @@ s390_base_mcck_handler:
 	lpswe	__LC_MCK_OLD_PSW
 
 	.section .bss
+	.align 8
 	.globl	s390_base_mcck_handler_fn
 s390_base_mcck_handler_fn:
 	.quad	0
 	.previous
 
-	.globl	s390_base_ext_handler
-s390_base_ext_handler:
+ENTRY(s390_base_ext_handler)
 	stmg	%r0,%r15,__LC_SAVE_AREA
 	basr	%r13,0
 0:	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -46,13 +46,13 @@ s390_base_ext_handler:
 	lpswe	__LC_EXT_OLD_PSW
 
 	.section .bss
+	.align 8
 	.globl s390_base_ext_handler_fn
 s390_base_ext_handler_fn:
 	.quad	0
 	.previous
 
-	.globl	s390_base_pgm_handler
-s390_base_pgm_handler:
+ENTRY(s390_base_pgm_handler)
 	stmg	%r0,%r15,__LC_SAVE_AREA
 	basr	%r13,0
 0:	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -70,6 +70,7 @@ disabled_wait_psw:
 	.quad	0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
 
 	.section .bss
+	.align 8
 	.globl s390_base_pgm_handler_fn
 s390_base_pgm_handler_fn:
 	.quad	0
@@ -77,8 +78,7 @@ s390_base_pgm_handler_fn:
 
 #else /* CONFIG_64BIT */
 
-	.globl	s390_base_mcck_handler
-s390_base_mcck_handler:
+ENTRY(s390_base_mcck_handler)
 	basr	%r13,0
 0:	l	%r15,__LC_PANIC_STACK	# load panic stack
 	ahi	%r15,-STACK_FRAME_OVERHEAD
@@ -93,13 +93,13 @@ s390_base_mcck_handler:
 2:	.long	s390_base_mcck_handler_fn
 
 	.section .bss
+	.align 4
 	.globl	s390_base_mcck_handler_fn
 s390_base_mcck_handler_fn:
 	.long	0
 	.previous
 
-	.globl	s390_base_ext_handler
-s390_base_ext_handler:
+ENTRY(s390_base_ext_handler)
 	stm	%r0,%r15,__LC_SAVE_AREA
 	basr	%r13,0
 0:	ahi	%r15,-STACK_FRAME_OVERHEAD
@@ -115,13 +115,13 @@ s390_base_ext_handler:
 2:	.long	s390_base_ext_handler_fn
 
 	.section .bss
+	.align 4
 	.globl	s390_base_ext_handler_fn
 s390_base_ext_handler_fn:
 	.long	0
 	.previous
 
-	.globl	s390_base_pgm_handler
-s390_base_pgm_handler:
+ENTRY(s390_base_pgm_handler)
 	stm	%r0,%r15,__LC_SAVE_AREA
 	basr	%r13,0
 0:	ahi	%r15,-STACK_FRAME_OVERHEAD
@@ -142,6 +142,7 @@ disabled_wait_psw:
 	.long	0x000a0000,0x00000000 + s390_base_pgm_handler
 
 	.section .bss
+	.align 4
 	.globl	s390_base_pgm_handler_fn
 s390_base_pgm_handler_fn:
 	.long	0

arch/s390/kernel/entry.S

@@ -9,8 +9,8 @@
  *		 Heiko Carstens <heiko.carstens@de.ibm.com>
  */
 
-#include <linux/linkage.h>
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/cache.h>
 #include <asm/errno.h>
 #include <asm/ptrace.h>
@@ -197,8 +197,7 @@ STACK_SIZE  = 1 << STACK_SHIFT
  * Returns:
  *  gpr2 = prev
  */
-	.globl	__switch_to
-__switch_to:
+ENTRY(__switch_to)
 	basr	%r1,0
 0:	l	%r4,__THREAD_info(%r2)		# get thread_info of prev
 	l	%r5,__THREAD_info(%r3)		# get thread_info of next
@@ -224,8 +223,7 @@ __critical_start:
  * are executed with interrupts enabled.
  */
 
-	.globl	system_call
-system_call:
+ENTRY(system_call)
 	stpt	__LC_SYNC_ENTER_TIMER
 sysc_saveall:
 	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
@@ -388,8 +386,7 @@ sysc_tracenogo:
 #
 # a new process exits the kernel with ret_from_fork
 #
-	.globl	ret_from_fork
-ret_from_fork:
+ENTRY(ret_from_fork)
 	l	%r13,__LC_SVC_NEW_PSW+4
 	l	%r12,__LC_THREAD_INFO	# load pointer to thread_info struct
 	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
@@ -405,8 +402,7 @@ ret_from_fork:
 # kernel_execve function needs to deal with pt_regs that is not
 # at the usual place
 #
-	.globl	kernel_execve
-kernel_execve:
+ENTRY(kernel_execve)
 	stm	%r12,%r15,48(%r15)
 	lr	%r14,%r15
 	l	%r13,__LC_SVC_NEW_PSW+4
@@ -438,8 +434,7 @@ kernel_execve:
  * Program check handler routine
  */
 
-	.globl	pgm_check_handler
-pgm_check_handler:
+ENTRY(pgm_check_handler)
 /*
  * First we need to check for a special case:
  * Single stepping an instruction that disables the PER event mask will
@@ -565,8 +560,7 @@ kernel_per:
  * IO interrupt handler routine
  */
 
-	.globl io_int_handler
-io_int_handler:
+ENTRY(io_int_handler)
 	stck	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
@@ -703,8 +697,7 @@ io_notify_resume:
  * External interrupt handler routine
  */
 
-	.globl	ext_int_handler
-ext_int_handler:
+ENTRY(ext_int_handler)
 	stck	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
@@ -731,8 +724,7 @@ __critical_end:
  * Machine check handler routines
  */
 
-	.globl mcck_int_handler
-mcck_int_handler:
+ENTRY(mcck_int_handler)
 	stck	__LC_MCCK_CLOCK
 	spt	__LC_CPU_TIMER_SAVE_AREA	# revalidate cpu timer
 	lm	%r0,%r15,__LC_GPREGS_SAVE_AREA	# revalidate gprs
@@ -818,8 +810,7 @@ mcck_return:
  */
 #ifdef CONFIG_SMP
 	__CPUINIT
-	.globl restart_int_handler
-restart_int_handler:
+ENTRY(restart_int_handler)
 	basr	%r1,0
 restart_base:
 	spt	restart_vtime-restart_base(%r1)
@@ -848,8 +839,7 @@ restart_vtime:
 /*
  * If we do not run with SMP enabled, let the new CPU crash ...
  */
-	.globl restart_int_handler
-restart_int_handler:
+ENTRY(restart_int_handler)
 	basr	%r1,0
 restart_base:
 	lpsw	restart_crash-restart_base(%r1)

arch/s390/kernel/entry64.S

@@ -9,8 +9,8 @@
  *		 Heiko Carstens <heiko.carstens@de.ibm.com>
  */
 
-#include <linux/linkage.h>
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/cache.h>
 #include <asm/errno.h>
 #include <asm/ptrace.h>
@@ -219,8 +219,7 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
  * Returns:
  *  gpr2 = prev
  */
-	.globl	__switch_to
-__switch_to:
+ENTRY(__switch_to)
 	lg	%r4,__THREAD_info(%r2)		# get thread_info of prev
 	lg	%r5,__THREAD_info(%r3)		# get thread_info of next
 	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
@@ -245,8 +244,7 @@ __critical_start:
  * are executed with interrupts enabled.
  */
 
-	.globl	system_call
-system_call:
+ENTRY(system_call)
 	stpt	__LC_SYNC_ENTER_TIMER
 sysc_saveall:
 	SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
@@ -408,8 +406,7 @@ sysc_tracenogo:
 #
 # a new process exits the kernel with ret_from_fork
 #
-	.globl	ret_from_fork
-ret_from_fork:
+ENTRY(ret_from_fork)
 	lg	%r13,__LC_SVC_NEW_PSW+8
 	lg	%r12,__LC_THREAD_INFO	# load pointer to thread_info struct
 	tm	SP_PSW+1(%r15),0x01	# forking a kernel thread ?
@@ -424,8 +421,7 @@ ret_from_fork:
 # kernel_execve function needs to deal with pt_regs that is not
 # at the usual place
 #
-	.globl	kernel_execve
-kernel_execve:
+ENTRY(kernel_execve)
 	stmg	%r12,%r15,96(%r15)
 	lgr	%r14,%r15
 	aghi	%r15,-SP_SIZE
@@ -455,8 +451,7 @@ kernel_execve:
  * Program check handler routine
  */
 
-	.globl	pgm_check_handler
-pgm_check_handler:
+ENTRY(pgm_check_handler)
 /*
  * First we need to check for a special case:
  * Single stepping an instruction that disables the PER event mask will
@@ -584,8 +579,7 @@ kernel_per:
 /*
  * IO interrupt handler routine
  */
-	.globl io_int_handler
-io_int_handler:
+ENTRY(io_int_handler)
 	stck	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+40
@@ -719,8 +713,7 @@ io_notify_resume:
 /*
  * External interrupt handler routine
  */
-	.globl	ext_int_handler
-ext_int_handler:
+ENTRY(ext_int_handler)
 	stck	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+40
@@ -749,8 +742,7 @@ __critical_end:
 /*
  * Machine check handler routines
  */
-	.globl mcck_int_handler
-mcck_int_handler:
+ENTRY(mcck_int_handler)
 	stck	__LC_MCCK_CLOCK
 	la	%r1,4095		# revalidate r1
 	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
@@ -836,8 +828,7 @@ mcck_done:
  */
 #ifdef CONFIG_SMP
 	__CPUINIT
-	.globl restart_int_handler
-restart_int_handler:
+ENTRY(restart_int_handler)
 	basr	%r1,0
 restart_base:
 	spt	restart_vtime-restart_base(%r1)
@@ -864,8 +855,7 @@ restart_vtime:
 /*
  * If we do not run with SMP enabled, let the new CPU crash ...
  */
-	.globl restart_int_handler
-restart_int_handler:
+ENTRY(restart_int_handler)
 	basr	%r1,0
 restart_base:
 	lpswe	restart_crash-restart_base(%r1)
@@ -1055,8 +1045,7 @@ cleanup_io_restore_insn:
  * %r2 pointer to sie control block
  * %r3 guest register save area
  */
-	.globl	sie64a
-sie64a:
+ENTRY(sie64a)
 	stmg	%r6,%r14,__SF_GPRS(%r15)	# save kernel registers
 	stg	%r2,__SF_EMPTY(%r15)		# save control block pointer
 	stg	%r3,__SF_EMPTY+8(%r15)		# save guest register save area

arch/s390/kernel/head.S

@@ -22,6 +22,7 @@
  */
 
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
@@ -383,8 +384,7 @@ iplstart:
 # doesn't need a builtin ipl record.
 #
 	.org	0x800
-	.globl	start
-start:
+ENTRY(start)
 	stm	%r0,%r15,0x07b0		# store registers
 	basr	%r12,%r0
 .base:
@@ -448,8 +448,7 @@ start:
 # or linload or SALIPL
 #
 	.org	0x10000
-	.globl	startup
-startup:
+ENTRY(startup)
 	basr	%r13,0			# get base
 .LPG0:
 	xc	0x200(256),0x200	# partially clear lowcore

arch/s390/kernel/head31.S

@@ -11,13 +11,13 @@
  */
 
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
 
 __HEAD
-	.globl	startup_continue
-startup_continue:
+ENTRY(startup_continue)
 	basr	%r13,0			# get base
 .LPG1:
 
@@ -78,8 +78,7 @@ startup_continue:
 .Lbase_cc:
 	.long	sched_clock_base_cc
 
-	.globl	_ehead
-_ehead:
+ENTRY(_ehead)
 
 #ifdef CONFIG_SHARED_KERNEL
 	.org	0x100000 - 0x11000	# head.o ends at 0x11000
@@ -88,8 +87,8 @@ _ehead:
 #
 # startup-code, running in absolute addressing mode
 #
-	.globl	_stext
-_stext:	basr	%r13,0			# get base
+ENTRY(_stext)
+	basr	%r13,0			# get base
 .LPG3:
 # check control registers
 	stctl	%c0,%c15,0(%r15)

arch/s390/kernel/head64.S

@@ -11,13 +11,13 @@
  */
 
 #include <linux/init.h>
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/thread_info.h>
 #include <asm/page.h>
 
 __HEAD
-	.globl	startup_continue
-startup_continue:
+ENTRY(startup_continue)
 	larl	%r1,sched_clock_base_cc
 	mvc	0(8,%r1),__LC_LAST_UPDATE_CLOCK
 	larl	%r13,.LPG1		# get base
@@ -76,8 +76,7 @@ startup_continue:
 	.long	0x80000000,0,0,0	# invalid access-list entries
 	.endr
 
-	.globl	_ehead
-_ehead:
+ENTRY(_ehead)
 
 #ifdef CONFIG_SHARED_KERNEL
 	.org	0x100000 - 0x11000	# head.o ends at 0x11000
@@ -86,8 +85,8 @@ _ehead:
 #
 # startup-code, running in absolute addressing mode
 #
-	.globl	_stext
-_stext:	basr	%r13,0			# get base
+ENTRY(_stext)
+	basr	%r13,0			# get base
 .LPG3:
 # check control registers
 	stctg	%c0,%c15,0(%r15)

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

arch/s390/kernel/mcount64.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
 	larl	%r1,function_trace_stop
 	icm	%r1,0xf,0(%r1)
@@ -37,8 +35,7 @@ ftrace_caller:
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 	lg	%r2,168(%r15)
 	lg	%r3,272(%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
@@ -52,8 +49,7 @@ ftrace_graph_caller:
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 
-	.globl	return_to_handler
-return_to_handler:
+ENTRY(return_to_handler)
 	stmg	%r2,%r5,32(%r15)
 	lgr	%r1,%r15
 	aghi	%r15,-160

arch/s390/kernel/reipl.S

@@ -6,14 +6,15 @@
  *    Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com)
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 
 #
 # do_reipl_asm
 # Parameter: r2 = schid of reipl device
 #
-		.globl	do_reipl_asm
-do_reipl_asm:	basr	%r13,0
+ENTRY(do_reipl_asm)
+		basr	%r13,0
 .Lpg0:		lpsw	.Lnewpsw-.Lpg0(%r13)
 .Lpg1:		# do store status of all registers
 

arch/s390/kernel/reipl64.S

@@ -4,6 +4,7 @@
  *		 Denis Joseph Barrow,
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 
 #
@@ -11,8 +12,8 @@
 # Parameter: r2 = schid of reipl device
 #
 
-		.globl	do_reipl_asm
-do_reipl_asm:	basr	%r13,0
+ENTRY(do_reipl_asm)
+		basr	%r13,0
 .Lpg0:		lpswe	.Lnewpsw-.Lpg0(%r13)
 .Lpg1:		# do store status of all registers
 

arch/s390/kernel/relocate_kernel.S

@@ -8,6 +8,8 @@
  *
  */
 
+#include <linux/linkage.h>
+
 /*
  * moves the new kernel to its destination...
  * %r2 = pointer to first kimage_entry_t
@@ -22,8 +24,7 @@
  */
 
 	.text
-	.globl		relocate_kernel
-	relocate_kernel:
+ENTRY(relocate_kernel)
 		basr	%r13,0		# base address
 	.base:
 		stnsm	sys_msk-.base(%r13),0xfb	# disable DAT
@@ -112,6 +113,7 @@
 		.byte	0
 		.align	8
 	relocate_kernel_end:
+	.align 8
 	.globl	relocate_kernel_len
 	relocate_kernel_len:
 		.quad	relocate_kernel_end - relocate_kernel

arch/s390/kernel/relocate_kernel64.S

@@ -8,6 +8,8 @@
  *
  */
 
+#include <linux/linkage.h>
+
 /*
  * moves the new kernel to its destination...
  * %r2 = pointer to first kimage_entry_t
@@ -23,8 +25,7 @@
  */
 
 	.text
-	.globl		relocate_kernel
-	relocate_kernel:
+ENTRY(relocate_kernel)
 		basr	%r13,0		# base address
 	.base:
 		stnsm	sys_msk-.base(%r13),0xfb	# disable DAT
@@ -115,6 +116,7 @@
 		.byte	0
 		.align	8
 	relocate_kernel_end:
+	.align 8
 	.globl	relocate_kernel_len
 	relocate_kernel_len:
 		.quad	relocate_kernel_end - relocate_kernel

arch/s390/kernel/sclp.S

@@ -8,6 +8,8 @@
  *
  */
 
+#include <linux/linkage.h>
+
 LC_EXT_NEW_PSW		= 0x58			# addr of ext int handler
 LC_EXT_NEW_PSW_64	= 0x1b0			# addr of ext int handler 64 bit
 LC_EXT_INT_PARAM	= 0x80			# addr of ext int parameter
@@ -260,8 +262,7 @@ _sclp_print:
 #   R2	= 0 on success, 1 on failure
 #
 
-	.globl _sclp_print_early
-_sclp_print_early:
+ENTRY(_sclp_print_early)
 	stm	%r6,%r15,24(%r15)		# save registers
 	ahi	%r15,-96			# create stack frame
 #ifdef CONFIG_64BIT

arch/s390/kernel/switch_cpu.S

@@ -5,6 +5,7 @@
  *
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/ptrace.h>
 
@@ -16,9 +17,7 @@
 #	     %r6 - destination cpu
 
 	.section .text
-	.align 4
-	.globl smp_switch_to_cpu
-smp_switch_to_cpu:
+ENTRY(smp_switch_to_cpu)
 	stm	%r6,%r15,__SF_GPRS(%r15)
 	lr	%r1,%r15
 	ahi	%r15,-STACK_FRAME_OVERHEAD
@@ -33,8 +32,7 @@ smp_switch_to_cpu:
 	brc	2,2b			/* busy, try again */
 3:	j	3b
 
-	.globl	smp_restart_cpu
-smp_restart_cpu:
+ENTRY(smp_restart_cpu)
 	basr	%r13,0
 0:	la	%r1,.gprregs_addr-0b(%r13)
 	l	%r1,0(%r1)

arch/s390/kernel/switch_cpu64.S

@@ -5,6 +5,7 @@
  *
  */
 
+#include <linux/linkage.h>
 #include <asm/asm-offsets.h>
 #include <asm/ptrace.h>
 
@@ -16,9 +17,7 @@
 #	     %r6 - destination cpu
 
 	.section .text
-	.align 4
-	.globl smp_switch_to_cpu
-smp_switch_to_cpu:
+ENTRY(smp_switch_to_cpu)
 	stmg	%r6,%r15,__SF_GPRS(%r15)
 	lgr	%r1,%r15
 	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -31,8 +30,7 @@ smp_switch_to_cpu:
 	brc	2,2b			/* busy, try again */
 3:	j	3b
 
-	.globl	smp_restart_cpu
-smp_restart_cpu:
+ENTRY(smp_restart_cpu)
 	larl	%r1,.gprregs
 	lmg	%r0,%r15,0(%r1)
 1:	sigp	%r0,%r5,__SIGP_SENSE	/* Wait for calling CPU */

arch/s390/kernel/swsusp_asm64.S

@@ -7,6 +7,7 @@
  *	      Michael Holzheu <holzheu@linux.vnet.ibm.com>
  */
 
+#include <linux/linkage.h>
 #include <asm/page.h>
 #include <asm/ptrace.h>
 #include <asm/thread_info.h>
@@ -22,9 +23,7 @@
  * This function runs with disabled interrupts.
  */
 	.section .text
-	.align	4
-	.globl swsusp_arch_suspend
-swsusp_arch_suspend:
+ENTRY(swsusp_arch_suspend)
 	stmg	%r6,%r15,__SF_GPRS(%r15)
 	lgr	%r1,%r15
 	aghi	%r15,-STACK_FRAME_OVERHEAD
@@ -112,8 +111,7 @@ swsusp_arch_suspend:
  * Then we return to the function that called swsusp_arch_suspend().
  * swsusp_arch_resume() runs with disabled interrupts.
  */
-	.globl swsusp_arch_resume
-swsusp_arch_resume:
+ENTRY(swsusp_arch_resume)
 	stmg	%r6,%r15,__SF_GPRS(%r15)
 	lgr	%r1,%r15
 	aghi	%r15,-STACK_FRAME_OVERHEAD

arch/s390/lib/qrnnd.S

 # S/390 __udiv_qrnnd
 
+#include <linux/linkage.h>
+
 # r2 : &__r
 # r3 : upper half of 64 bit word n
 # r4 : lower half of 64 bit word n
@@ -8,8 +10,7 @@
 # the quotient q is to be returned
 
 	.text
-	.globl __udiv_qrnnd
-__udiv_qrnnd:
+ENTRY(__udiv_qrnnd)
 	st    %r2,24(%r15)	  # store pointer to reminder for later
 	lr    %r0,%r3		  # reload n
 	lr    %r1,%r4