[PATCH] time interpolator fixes

- Remove the setting of CLOCK_REALTIME and CLOCK_MONOTONIC resolution
  according to the interpolator resolution since this causes periodic timer
  signals to fail.  The clocks will still be high-resolution but the
  "resolution" reported reflects the timer intervals possible via
  timer_settime (also more conformant to what the Single Unix Specification
  says).

- Make the IA64 clock_gettime fastcall fall back on negative clock
  numbers instead of returning CLOCK_REALTIME.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ia64/kernel/fsys.S

@@ -234,7 +234,7 @@ ENTRY(fsys_gettimeofday)
 	cmp.eq p9,p0 = 1,r8	// MMIO64 ?
 	extr r2 = r21,24,8	// time_interpolator->jitter
 	cmp.eq p10,p0 = 2,r8	// MMIO32 ?
-	cmp.lt p11,p0 = 2,r8	// function?
+	cmp.ltu p11,p0 = 2,r8	// function or other clock
 (p11)	br.cond.spnt.many fsys_fallback_syscall
 	;;
 	setf.sig f7 = r3	// Setup for scaling of counter
@@ -338,7 +338,7 @@ ENTRY(fsys_clock_gettime)
 	.prologue
 	.altrp b6
 	.body
-	cmp4.lt p6, p0 = CLOCK_MONOTONIC, r32
+	cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32
 	// Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC
 (p6)	br.spnt.few fsys_fallback_syscall
 	mov r31 = r33

kernel/posix-timers.c

@@ -219,11 +219,6 @@ static __init int init_posix_timers(void)
 		.clock_set = do_posix_clock_monotonic_settime
 	};
 
-#ifdef CONFIG_TIME_INTERPOLATION
-	/* Clocks are more accurate with time interpolators */
-	clock_realtime.res = clock_monotonic.res = time_interpolator_resolution();
-#endif
-
 	register_posix_clock(CLOCK_REALTIME, &clock_realtime);
 	register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);