s390: make use of user_mode() macro where possible

We use the user_mode() helper already at several places but also
have the open coded variant at other places.
Convert the code to always use the helper function.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/dis.c

@@ -1531,7 +1531,7 @@ static int print_insn(char *buffer, unsigned char *code, unsigned long addr)
 
 void show_code(struct pt_regs *regs)
 {
-	char *mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
+	char *mode = user_mode(regs) ? "User" : "Krnl";
 	unsigned char code[64];
 	char buffer[64], *ptr;
 	mm_segment_t old_fs;
@@ -1540,7 +1540,7 @@ void show_code(struct pt_regs *regs)
 
 	/* Get a snapshot of the 64 bytes surrounding the fault address. */
 	old_fs = get_fs();
-	set_fs((regs->psw.mask & PSW_MASK_PSTATE) ? USER_DS : KERNEL_DS);
+	set_fs(user_mode(regs) ? USER_DS : KERNEL_DS);
 	for (start = 32; start && regs->psw.addr >= 34 - start; start -= 2) {
 		addr = regs->psw.addr - 34 + start;
 		if (__copy_from_user(code + start - 2,

arch/s390/kernel/traps.c

@@ -185,7 +185,7 @@ void show_registers(struct pt_regs *regs)
 {
 	char *mode;
 
-	mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
+	mode = user_mode(regs) ? "User" : "Krnl";
 	printk("%s PSW : %p %p",
 	       mode, (void *) regs->psw.mask,
 	       (void *) regs->psw.addr);
@@ -225,7 +225,7 @@ void show_regs(struct pt_regs *regs)
 	       (void *) current->thread.ksp);
 	show_registers(regs);
 	/* Show stack backtrace if pt_regs is from kernel mode */
-	if (!(regs->psw.mask & PSW_MASK_PSTATE))
+	if (!user_mode(regs))
 		show_trace(NULL, (unsigned long *) regs->gprs[15]);
 	show_last_breaking_event(regs);
 }
@@ -300,7 +300,7 @@ static void __kprobes do_trap(struct pt_regs *regs,
 		       regs->int_code, si_signo) == NOTIFY_STOP)
 		return;
 
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		info.si_signo = si_signo;
 		info.si_errno = 0;
 		info.si_code = si_code;
@@ -341,7 +341,7 @@ void __kprobes do_per_trap(struct pt_regs *regs)
 
 static void default_trap_handler(struct pt_regs *regs)
 {
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		report_user_fault(regs, SIGSEGV);
 		do_exit(SIGSEGV);
 	} else
@@ -410,7 +410,7 @@ static void __kprobes illegal_op(struct pt_regs *regs)
 
 	location = get_psw_address(regs);
 
-	if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
 			return;
 		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
@@ -478,7 +478,7 @@ void specification_exception(struct pt_regs *regs)
 
 	location = (__u16 __user *) get_psw_address(regs);
 
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		get_user(*((__u16 *) opcode), location);
 		switch (opcode[0]) {
 		case 0x28: /* LDR Rx,Ry   */
@@ -531,7 +531,7 @@ static void data_exception(struct pt_regs *regs)
 		asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
 
 #ifdef CONFIG_MATHEMU
-        else if (regs->psw.mask & PSW_MASK_PSTATE) {
+	else if (user_mode(regs)) {
         	__u8 opcode[6];
 		get_user(*((__u16 *) opcode), location);
 		switch (opcode[0]) {
@@ -598,7 +598,7 @@ static void data_exception(struct pt_regs *regs)
 static void space_switch_exception(struct pt_regs *regs)
 {
 	/* Set user psw back to home space mode. */
-	if (regs->psw.mask & PSW_MASK_PSTATE)
+	if (user_mode(regs))
 		regs->psw.mask |= PSW_ASC_HOME;
 	/* Send SIGILL. */
 	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");

arch/s390/mm/fault.c

@@ -220,7 +220,7 @@ static noinline void do_fault_error(struct pt_regs *regs, int fault)
 	case VM_FAULT_BADACCESS:
 	case VM_FAULT_BADMAP:
 		/* Bad memory access. Check if it is kernel or user space. */
-		if (regs->psw.mask & PSW_MASK_PSTATE) {
+		if (user_mode(regs)) {
 			/* User mode accesses just cause a SIGSEGV */
 			si_code = (fault == VM_FAULT_BADMAP) ?
 				SEGV_MAPERR : SEGV_ACCERR;
@@ -236,13 +236,13 @@ static noinline void do_fault_error(struct pt_regs *regs, int fault)
 		break;
 	default: /* fault & VM_FAULT_ERROR */
 		if (fault & VM_FAULT_OOM) {
-			if (!(regs->psw.mask & PSW_MASK_PSTATE))
+			if (!user_mode(regs))
 				do_no_context(regs);
 			else
 				pagefault_out_of_memory();
 		} else if (fault & VM_FAULT_SIGBUS) {
 			/* Kernel mode? Handle exceptions or die */
-			if (!(regs->psw.mask & PSW_MASK_PSTATE))
+			if (!user_mode(regs))
 				do_no_context(regs);
 			else
 				do_sigbus(regs);
@@ -436,7 +436,7 @@ void __kprobes do_asce_exception(struct pt_regs *regs)
 	}
 
 	/* User mode accesses just cause a SIGSEGV */
-	if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		do_sigsegv(regs, SEGV_MAPERR);
 		return;
 	}

arch/s390/oprofile/backtrace.c

@@ -58,7 +58,7 @@ void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
 	unsigned long head;
 	struct stack_frame* head_sf;
 
-	if (user_mode (regs))
+	if (user_mode(regs))
 		return;
 
 	head = regs->gprs[15];