x86: merge tsc_init and clocksource code

Unify the clocksource code.
Unify the tsc_init code.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: Dan Hecht <dhecht@vmware.com>
Cc: Dan Hecht <dhecht@vmware.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 106 deletions

diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
deleted file mode 100644
index 80a274b018c2..000000000000
--- a/arch/x86/kernel/tsc_64.c
+++ /dev/null
@@ -1,106 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/clocksource.h>
-#include <linux/time.h>
-#include <linux/acpi.h>
-#include <linux/cpufreq.h>
-#include <linux/acpi_pmtmr.h>
-
-#include <asm/hpet.h>
-#include <asm/timex.h>
-#include <asm/timer.h>
-#include <asm/vgtod.h>
-
-extern int tsc_unstable;
-extern int tsc_disabled;
-
-/*
- * Make an educated guess if the TSC is trustworthy and synchronized
- * over all CPUs.
- */
-__cpuinit int unsynchronized_tsc(void)
-{
-	if (tsc_unstable)
-		return 1;
-
-#ifdef CONFIG_SMP
-	if (apic_is_clustered_box())
-		return 1;
-#endif
-
-	if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
-		return 0;
-
-	/* Assume multi socket systems are not synchronized */
-	return num_present_cpus() > 1;
-}
-
-static struct clocksource clocksource_tsc;
-
-/*
- * We compare the TSC to the cycle_last value in the clocksource
- * structure to avoid a nasty time-warp. This can be observed in a
- * very small window right after one CPU updated cycle_last under
- * xtime/vsyscall_gtod lock and the other CPU reads a TSC value which
- * is smaller than the cycle_last reference value due to a TSC which
- * is slighty behind. This delta is nowhere else observable, but in
- * that case it results in a forward time jump in the range of hours
- * due to the unsigned delta calculation of the time keeping core
- * code, which is necessary to support wrapping clocksources like pm
- * timer.
- */
-static cycle_t read_tsc(void)
-{
-	cycle_t ret = (cycle_t)get_cycles();
-
-	return ret >= clocksource_tsc.cycle_last ?
-		ret : clocksource_tsc.cycle_last;
-}
-
-static cycle_t __vsyscall_fn vread_tsc(void)
-{
-	cycle_t ret = (cycle_t)vget_cycles();
-
-	return ret >= __vsyscall_gtod_data.clock.cycle_last ?
-		ret : __vsyscall_gtod_data.clock.cycle_last;
-}
-
-static struct clocksource clocksource_tsc = {
-	.name			= "tsc",
-	.rating			= 300,
-	.read			= read_tsc,
-	.mask			= CLOCKSOURCE_MASK(64),
-	.shift			= 22,
-	.flags			= CLOCK_SOURCE_IS_CONTINUOUS |
-				  CLOCK_SOURCE_MUST_VERIFY,
-	.vread			= vread_tsc,
-};
-
-void mark_tsc_unstable(char *reason)
-{
-	if (!tsc_unstable) {
-		tsc_unstable = 1;
-		printk("Marking TSC unstable due to %s\n", reason);
-		/* Change only the rating, when not registered */
-		if (clocksource_tsc.mult)
-			clocksource_change_rating(&clocksource_tsc, 0);
-		else
-			clocksource_tsc.rating = 0;
-	}
-}
-EXPORT_SYMBOL_GPL(mark_tsc_unstable);
-
-void __init init_tsc_clocksource(void)
-{
-	if (tsc_disabled > 0)
-		return;
-
-	clocksource_tsc.mult = clocksource_khz2mult(tsc_khz,
-			clocksource_tsc.shift);
-	if (check_tsc_unstable())
-		clocksource_tsc.rating = 0;
-
-	clocksource_register(&clocksource_tsc);
-}