This reverts commit 
ff7bbb9c6ab6e6620429daeff39424bbde1a94b4.
Sasha Levin is seeing odd jump in time values during boot of a KVM guest:
[...]
[    0.000000] tsc: Detected 2260.998 MHz processor
[
3376355.247558] Calibrating delay loop (skipped) preset value..
[...]
and bisected them to this commit.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 #include <linux/percpu.h>
 #include <linux/hardirq.h>
 #include <linux/memblock.h>
-#include <linux/sched.h>
 
 #include <asm/x86_init.h>
 #include <asm/reboot.h>
 
        if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))
                pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
-
-       set_sched_clock_stable();
 }
 
 int __init kvm_setup_vsyscall_timeinfo(void)