Input: Evdev - unify MONOTONIC and BOOTTIME clock behavior

Now that the MONOTONIC and BOOTTIME clocks are indentical, remove all the
special casing.

The user space visible interfaces still support both clocks, but their behavior
is identical.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kevin Easton <kevin@guarana.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Salyzyn <salyzyn@android.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-input@vger.kernel.org
Link: http://lkml.kernel.org/r/20180301165150.155899327@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

drivers/input/evdev.c

@@ -31,7 +31,6 @@
 enum evdev_clock_type {
 	EV_CLK_REAL = 0,
 	EV_CLK_MONO,
-	EV_CLK_BOOT,
 	EV_CLK_MAX
 };
 
@@ -198,12 +197,10 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
 	case CLOCK_REALTIME:
 		clk_type = EV_CLK_REAL;
 		break;
+	case CLOCK_BOOTTIME:
 	case CLOCK_MONOTONIC:
 		clk_type = EV_CLK_MONO;
 		break;
-	case CLOCK_BOOTTIME:
-		clk_type = EV_CLK_BOOT;
-		break;
 	default:
 		return -EINVAL;
 	}
@@ -314,8 +311,6 @@ static void evdev_events(struct input_handle *handle,
 
 	ev_time[EV_CLK_MONO] = ktime_get();
 	ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);
-	ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],
-						 TK_OFFS_BOOT);
 
 	rcu_read_lock();