um: Make local functions and variables static

This will also fix the warnings like:

warning: no previous prototype for ‘fork_handler’ [-Wmissing-prototypes]
  140 | void fork_handler(void)
      |      ^~~~~~~~~~~~
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/drivers/pcap_kern.c

@@ -15,7 +15,7 @@ struct pcap_init {
 	char *filter;
 };
 
-void pcap_init_kern(struct net_device *dev, void *data)
+static void pcap_init_kern(struct net_device *dev, void *data)
 {
 	struct uml_net_private *pri;
 	struct pcap_data *ppri;
@@ -50,7 +50,7 @@ static const struct net_kern_info pcap_kern_info = {
 	.write			= pcap_write,
 };
 
-int pcap_setup(char *str, char **mac_out, void *data)
+static int pcap_setup(char *str, char **mac_out, void *data)
 {
 	struct pcap_init *init = data;
 	char *remain, *host_if = NULL, *options[2] = { NULL, NULL };

arch/um/drivers/ubd_user.c

@@ -23,7 +23,7 @@
 #include <os.h>
 #include <poll.h>
 
-struct pollfd kernel_pollfd;
+static struct pollfd kernel_pollfd;
 
 int start_io_thread(unsigned long sp, int *fd_out)
 {

arch/um/kernel/kmsg_dump.c

@@ -57,7 +57,7 @@ static struct kmsg_dumper kmsg_dumper = {
 	.dump = kmsg_dumper_stdout
 };
 
-int __init kmsg_dumper_stdout_init(void)
+static int __init kmsg_dumper_stdout_init(void)
 {
 	return kmsg_dump_register(&kmsg_dumper);
 }

arch/um/kernel/process.c

@@ -137,7 +137,7 @@ void new_thread_handler(void)
 }
 
 /* Called magically, see new_thread_handler above */
-void fork_handler(void)
+static void fork_handler(void)
 {
 	force_flush_all();
 
@@ -268,14 +268,14 @@ int clear_user_proc(void __user *buf, int size)
 static atomic_t using_sysemu = ATOMIC_INIT(0);
 int sysemu_supported;
 
-void set_using_sysemu(int value)
+static void set_using_sysemu(int value)
 {
 	if (value > sysemu_supported)
 		return;
 	atomic_set(&using_sysemu, value);
 }
 
-int get_using_sysemu(void)
+static int get_using_sysemu(void)
 {
 	return atomic_read(&using_sysemu);
 }
@@ -313,7 +313,7 @@ static const struct proc_ops sysemu_proc_ops = {
 	.proc_write	= sysemu_proc_write,
 };
 
-int __init make_proc_sysemu(void)
+static int __init make_proc_sysemu(void)
 {
 	struct proc_dir_entry *ent;
 	if (!sysemu_supported)

arch/um/kernel/time.c

@@ -319,7 +319,7 @@ void time_travel_add_event_rel(struct time_travel_event *e,
 	time_travel_add_event(e, time_travel_time + delay_ns);
 }
 
-void time_travel_periodic_timer(struct time_travel_event *e)
+static void time_travel_periodic_timer(struct time_travel_event *e)
 {
 	time_travel_add_event(&time_travel_timer_event,
 			      time_travel_time + time_travel_timer_interval);
@@ -812,7 +812,7 @@ unsigned long calibrate_delay_is_known(void)
 	return 0;
 }
 
-int setup_time_travel(char *str)
+static int setup_time_travel(char *str)
 {
 	if (strcmp(str, "=inf-cpu") == 0) {
 		time_travel_mode = TT_MODE_INFCPU;
@@ -862,7 +862,7 @@ __uml_help(setup_time_travel,
 "devices using it, assuming the device has the right capabilities.\n"
 "The optional ID is a 64-bit integer that's sent to the central scheduler.\n");
 
-int setup_time_travel_start(char *str)
+static int setup_time_travel_start(char *str)
 {
 	int err;
 

arch/um/os-Linux/drivers/ethertap_kern.c

@@ -63,7 +63,7 @@ const struct net_kern_info ethertap_kern_info = {
 	.write 			= etap_write,
 };
 
-int ethertap_setup(char *str, char **mac_out, void *data)
+static int ethertap_setup(char *str, char **mac_out, void *data)
 {
 	struct ethertap_init *init = data;
 

arch/um/os-Linux/drivers/tuntap_kern.c

@@ -53,7 +53,7 @@ const struct net_kern_info tuntap_kern_info = {
 	.write 			= tuntap_write,
 };
 
-int tuntap_setup(char *str, char **mac_out, void *data)
+static int tuntap_setup(char *str, char **mac_out, void *data)
 {
 	struct tuntap_init *init = data;
 

arch/um/os-Linux/signal.c

@@ -72,7 +72,7 @@ static int signals_blocked;
 static unsigned int signals_pending;
 static unsigned int signals_active = 0;
 
-void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
+static void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
 {
 	int enabled = signals_enabled;
 
@@ -108,7 +108,7 @@ static void timer_real_alarm_handler(mcontext_t *mc)
 	timer_handler(SIGALRM, NULL, &regs);
 }
 
-void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
+static void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
 {
 	int enabled;
 

arch/x86/um/os-Linux/registers.c

@@ -17,7 +17,7 @@
 #include <linux/elf.h>
 #include <registers.h>
 
-int have_xstate_support;
+static int have_xstate_support;
 
 int save_i387_registers(int pid, unsigned long *fp_regs)
 {

arch/x86/um/tls_32.c

@@ -20,7 +20,7 @@
 static int host_supports_tls = -1;
 int host_gdt_entry_tls_min;
 
-int do_set_thread_area(struct user_desc *info)
+static int do_set_thread_area(struct user_desc *info)
 {
 	int ret;
 	u32 cpu;