1 files changed, 0 insertions, 198 deletions
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
deleted file mode 100644
index 0aa5fed8b9e..00000000000
--- a/arch/x86/kernel/tsc_sync.c
+++ /dev/null
@@ -1,198 +0,0 @@
-/*
- * check TSC synchronization.
- *
- * Copyright (C) 2006, Red Hat, Inc., Ingo Molnar
- *
- * We check whether all boot CPUs have their TSC's synchronized,
- * print a warning if not and turn off the TSC clock-source.
- *
- * The warp-check is point-to-point between two CPUs, the CPU
- * initiating the bootup is the 'source CPU', the freshly booting
- * CPU is the 'target CPU'.
- *
- * Only two CPUs may participate - they can enter in any order.
- * ( The serial nature of the boot logic and the CPU hotplug lock
- *   protects against more than 2 CPUs entering this code. )
- */
-#include <linux/spinlock.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/nmi.h>
-#include <asm/tsc.h>
-
-/*
- * Entry/exit counters that make sure that both CPUs
- * run the measurement code at once:
- */
-static __cpuinitdata atomic_t start_count;
-static __cpuinitdata atomic_t stop_count;
-
-/*
- * We use a raw spinlock in this exceptional case, because
- * we want to have the fastest, inlined, non-debug version
- * of a critical section, to be able to prove TSC time-warps:
- */
-static __cpuinitdata arch_spinlock_t sync_lock = __ARCH_SPIN_LOCK_UNLOCKED;
-
-static __cpuinitdata cycles_t last_tsc;
-static __cpuinitdata cycles_t max_warp;
-static __cpuinitdata int nr_warps;
-
-/*
- * TSC-warp measurement loop running on both CPUs:
- */
-static __cpuinit void check_tsc_warp(void)
-{
-	cycles_t start, now, prev, end;
-	int i;
-
-	rdtsc_barrier();
-	start = get_cycles();
-	rdtsc_barrier();
-	/*
-	 * The measurement runs for 20 msecs:
-	 */
-	end = start + tsc_khz * 20ULL;
-	now = start;
-
-	for (i = 0; ; i++) {
-		/*
-		 * We take the global lock, measure TSC, save the
-		 * previous TSC that was measured (possibly on
-		 * another CPU) and update the previous TSC timestamp.
-		 */
-		arch_spin_lock(&sync_lock);
-		prev = last_tsc;
-		rdtsc_barrier();
-		now = get_cycles();
-		rdtsc_barrier();
-		last_tsc = now;
-		arch_spin_unlock(&sync_lock);
-
-		/*
-		 * Be nice every now and then (and also check whether
-		 * measurement is done [we also insert a 10 million
-		 * loops safety exit, so we dont lock up in case the
-		 * TSC readout is totally broken]):
-		 */
-		if (unlikely(!(i & 7))) {
-			if (now > end || i > 10000000)
-				break;
-			cpu_relax();
-			touch_nmi_watchdog();
-		}
-		/*
-		 * Outside the critical section we can now see whether
-		 * we saw a time-warp of the TSC going backwards:
-		 */
-		if (unlikely(prev > now)) {
-			arch_spin_lock(&sync_lock);
-			max_warp = max(max_warp, prev - now);
-			nr_warps++;
-			arch_spin_unlock(&sync_lock);
-		}
-	}
-	WARN(!(now-start),
-		"Warning: zero tsc calibration delta: %Ld [max: %Ld]\n",
-			now-start, end-start);
-}
-
-/*
- * Source CPU calls into this - it waits for the freshly booted
- * target CPU to arrive and then starts the measurement:
- */
-void __cpuinit check_tsc_sync_source(int cpu)
-{
-	int cpus = 2;
-
-	/*
-	 * No need to check if we already know that the TSC is not
-	 * synchronized:
-	 */
-	if (unsynchronized_tsc())
-		return;
-
-	if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE)) {
-		if (cpu == (nr_cpu_ids-1) || system_state != SYSTEM_BOOTING)
-			pr_info(
-			"Skipped synchronization checks as TSC is reliable.\n");
-		return;
-	}
-
-	/*
-	 * Reset it - in case this is a second bootup:
-	 */
-	atomic_set(&stop_count, 0);
-
-	/*
-	 * Wait for the target to arrive:
-	 */
-	while (atomic_read(&start_count) != cpus-1)
-		cpu_relax();
-	/*
-	 * Trigger the target to continue into the measurement too:
-	 */
-	atomic_inc(&start_count);
-
-	check_tsc_warp();
-
-	while (atomic_read(&stop_count) != cpus-1)
-		cpu_relax();
-
-	if (nr_warps) {
-		pr_warning("TSC synchronization [CPU#%d -> CPU#%d]:\n",
-			smp_processor_id(), cpu);
-		pr_warning("Measured %Ld cycles TSC warp between CPUs, "
-			   "turning off TSC clock.\n", max_warp);
-		mark_tsc_unstable("check_tsc_sync_source failed");
-	} else {
-		pr_debug("TSC synchronization [CPU#%d -> CPU#%d]: passed\n",
-			smp_processor_id(), cpu);
-	}
-
-	/*
-	 * Reset it - just in case we boot another CPU later:
-	 */
-	atomic_set(&start_count, 0);
-	nr_warps = 0;
-	max_warp = 0;
-	last_tsc = 0;
-
-	/*
-	 * Let the target continue with the bootup:
-	 */
-	atomic_inc(&stop_count);
-}
-
-/*
- * Freshly booted CPUs call into this:
- */
-void __cpuinit check_tsc_sync_target(void)
-{
-	int cpus = 2;
-
-	if (unsynchronized_tsc() || boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
-		return;
-
-	/*
-	 * Register this CPU's participation and wait for the
-	 * source CPU to start the measurement:
-	 */
-	atomic_inc(&start_count);
-	while (atomic_read(&start_count) != cpus)
-		cpu_relax();
-
-	check_tsc_warp();
-
-	/*
-	 * Ok, we are done:
-	 */
-	atomic_inc(&stop_count);
-
-	/*
-	 * Wait for the source CPU to print stuff:
-	 */
-	while (atomic_read(&stop_count) != cpus)
-		cpu_relax();
-}