Input: move input_bits_to_string() to input-compat.c

The input_bits_to_string() function has special handling for compat
tasks, formatting the output as a sequence of 32-bit hex values. To
better isolate compatibility-related code, move it from
drivers/input/input.c to drivers/input/input-compat.c.

No functional change intended.

Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/input-compat.c

···
  */
 
 #include <linux/export.h>
+#include <linux/sprintf.h>
 #include <linux/uaccess.h>
 #include "input-compat.h"
 
···
 	return 0;
 }
 
+int input_bits_to_string(char *buf, int buf_size, unsigned long bits,
+			 bool skip_empty)
+{
+	int len = 0;
+
+	if (in_compat_syscall()) {
+		u32 dword = bits >> 32;
+		if (dword || !skip_empty)
+			len += snprintf(buf, buf_size, "%x ", dword);
+
+		dword = bits & 0xffffffffUL;
+		if (dword || !skip_empty || len)
+			len += snprintf(buf + len, max(buf_size - len, 0),
+					"%x", dword);
+	} else {
+		if (bits || !skip_empty)
+			len += snprintf(buf, buf_size, "%lx", bits);
+	}
+
+	return len;
+}
+
 #else
 
 int input_event_from_user(const char __user *buffer,
···
 		return -EFAULT;
 
 	return 0;
+}
+
+int input_bits_to_string(char *buf, int buf_size, unsigned long bits,
+			 bool skip_empty)
+{
+	return bits || !skip_empty ?
+		snprintf(buf, buf_size, "%lx", bits) : 0;
 }
 
 #endif /* CONFIG_COMPAT */

drivers/input/input-compat.h

···
 int input_ff_effect_from_user(const char __user *buffer, size_t size,
 			      struct ff_effect *effect);
 
+int input_bits_to_string(char *buf, int buf_size, unsigned long bits,
+                         bool skip_empty);
+
 #endif /* _INPUT_COMPAT_H */

drivers/input/input.c

···
 	return error;
 }
 
-#ifdef CONFIG_COMPAT
-
-static int input_bits_to_string(char *buf, int buf_size,
-				unsigned long bits, bool skip_empty)
-{
-	int len = 0;
-
-	if (in_compat_syscall()) {
-		u32 dword = bits >> 32;
-		if (dword || !skip_empty)
-			len += snprintf(buf, buf_size, "%x ", dword);
-
-		dword = bits & 0xffffffffUL;
-		if (dword || !skip_empty || len)
-			len += snprintf(buf + len, max(buf_size - len, 0),
-					"%x", dword);
-	} else {
-		if (bits || !skip_empty)
-			len += snprintf(buf, buf_size, "%lx", bits);
-	}
-
-	return len;
-}
-
-#else /* !CONFIG_COMPAT */
-
-static int input_bits_to_string(char *buf, int buf_size,
-				unsigned long bits, bool skip_empty)
-{
-	return bits || !skip_empty ?
-		snprintf(buf, buf_size, "%lx", bits) : 0;
-}
-
-#endif
-
 #ifdef CONFIG_PROC_FS
 
 static struct proc_dir_entry *proc_bus_input_dir;