y2038: remove CONFIG_64BIT_TIME

The CONFIG_64BIT_TIME option is defined on all architectures, and can
be removed for simplicity now.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/Kconfig b/arch/Kconfig
index 5f8a5d8..0e1fded 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -796,14 +796,6 @@
 config COMPAT_OLD_SIGACTION
 	bool
 
-config 64BIT_TIME
-	def_bool y
-	help
-	  This should be selected by all architectures that need to support
-	  new system calls with a 64-bit time_t. This is relevant on all 32-bit
-	  architectures, and 64-bit architectures as part of compat syscall
-	  handling.
-
 config COMPAT_32BIT_TIME
 	def_bool !64BIT || COMPAT
 	help
diff --git a/fs/aio.c b/fs/aio.c
index 01e0fb9..447e3a0 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -2056,7 +2056,7 @@
  *	specifies an infinite timeout. Note that the timeout pointed to by
  *	timeout is relative.  Will fail with -ENOSYS if not implemented.
  */
-#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
+#ifdef CONFIG_64BIT
 
 SYSCALL_DEFINE5(io_getevents, aio_context_t, ctx_id,
 		long, min_nr,
diff --git a/ipc/syscall.c b/ipc/syscall.c
index 581bdff..dfb0e98 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -30,7 +30,7 @@
 		return ksys_semtimedop(first, (struct sembuf __user *)ptr,
 				       second, NULL);
 	case SEMTIMEDOP:
-		if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
+		if (IS_ENABLED(CONFIG_64BIT))
 			return ksys_semtimedop(first, ptr, second,
 			        (const struct __kernel_timespec __user *)fifth);
 		else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 6560553..9e20873 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1940,7 +1940,7 @@
 	return ret;
 }
 
-#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
+#ifdef CONFIG_64BIT
 
 SYSCALL_DEFINE2(nanosleep, struct __kernel_timespec __user *, rqtp,
 		struct __kernel_timespec __user *, rmtp)
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 5c54ca6..96b8c02 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -267,7 +267,7 @@
 }
 #endif
 
-#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
+#ifdef CONFIG_64BIT
 SYSCALL_DEFINE1(adjtimex, struct __kernel_timex __user *, txc_p)
 {
 	struct __kernel_timex txc;		/* Local copy of parameter */
@@ -881,7 +881,7 @@
 	ts->tv_sec = kts.tv_sec;
 
 	/* Zero out the padding for 32 bit systems or in compat mode */
-	if (IS_ENABLED(CONFIG_64BIT_TIME) && in_compat_syscall())
+	if (in_compat_syscall())
 		kts.tv_nsec &= 0xFFFFFFFFUL;
 
 	ts->tv_nsec = kts.tv_nsec;
diff --git a/net/socket.c b/net/socket.c
index 6a9ab7a..98f6544 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2833,7 +2833,7 @@
 				    a[2], true);
 		break;
 	case SYS_RECVMMSG:
-		if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
+		if (IS_ENABLED(CONFIG_64BIT))
 			err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1,
 					     a[2], a[3],
 					     (struct __kernel_timespec __user *)a[4],