um: rename set_signals() to um_set_signals()

Rename set_signals() as there's at least one driver that
uses the same name and can now be built on UM due to PCI
support, and thus we can get symbol conflicts.

Also rename set_signals_trace() to be consistent.

Reported-by: kernel test robot <[e-mail]>
Fixes: 68f5d3f3b654 ("um: add PCI over virtio emulation driver")
Signed-off-by: Johannes Berg <[e-mail]>
Signed-off-by: Richard Weinberger <[e-mail]>

arch/um/include/asm/irqflags.h

···
 #define __UM_IRQFLAGS_H
 
 extern int signals_enabled;
-int set_signals(int enable);
+int um_set_signals(int enable);
 void block_signals(void);
 void unblock_signals(void);
 
···
 #define arch_local_irq_restore arch_local_irq_restore
 static inline void arch_local_irq_restore(unsigned long flags)
 {
-	set_signals(flags);
+	um_set_signals(flags);
 }
 
 #define arch_local_irq_enable arch_local_irq_enable

arch/um/include/shared/longjmp.h

···
 	enable = *(volatile int *)&signals_enabled;	\
 	n = setjmp(*buf);				\
 	if(n != 0)					\
-		set_signals_trace(enable);		\
+		um_set_signals_trace(enable);		\
 	n; })
 
 #endif

arch/um/include/shared/os.h

···
 extern int change_sig(int signal, int on);
 extern void block_signals(void);
 extern void unblock_signals(void);
-extern int set_signals(int enable);
-extern int set_signals_trace(int enable);
+extern int um_set_signals(int enable);
+extern int um_set_signals_trace(int enable);
 extern int os_is_signal_stack(void);
 extern void deliver_alarm(void);
 extern void register_pm_wake_signal(void);

arch/um/kernel/ksyms.c

···
 #include <linux/module.h>
 #include <os.h>
 
-EXPORT_SYMBOL(set_signals);
+EXPORT_SYMBOL(um_set_signals);
 EXPORT_SYMBOL(signals_enabled);
 
 EXPORT_SYMBOL(os_stat_fd);

arch/um/os-Linux/sigio.c

···
 	int n;
 	char c;
 
-	flags = set_signals_trace(0);
+	flags = um_set_signals_trace(0);
 	CATCH_EINTR(n = write(sigio_private[0], &c, sizeof(c)));
 	if (n != sizeof(c)) {
 		printk(UM_KERN_ERR "update_thread : write failed, err = %d\n",
···
 		goto fail;
 	}
 
-	set_signals_trace(flags);
+	um_set_signals_trace(flags);
 	return;
  fail:
 	/* Critical section start */
···
 	close(write_sigio_fds[0]);
 	close(write_sigio_fds[1]);
 	/* Critical section end */
-	set_signals_trace(flags);
+	um_set_signals_trace(flags);
 }
 
 int __add_sigio_fd(int fd)

arch/um/os-Linux/signal.c

···
 
 	sig_handler_common(sig, si, mc);
 
-	set_signals_trace(enabled);
+	um_set_signals_trace(enabled);
 }
 
 static void timer_real_alarm_handler(mcontext_t *mc)
···
 
 	signals_active &= ~SIGALRM_MASK;
 
-	set_signals_trace(enabled);
+	um_set_signals_trace(enabled);
 }
 
 void deliver_alarm(void) {
···
 	}
 }
 
-int set_signals(int enable)
+int um_set_signals(int enable)
 {
 	int ret;
 	if (signals_enabled == enable)
···
 	return ret;
 }
 
-int set_signals_trace(int enable)
+int um_set_signals_trace(int enable)
 {
 	int ret;
 	if (signals_enabled == enable)