x86: Use this_cpu_ops to optimize code
Go through x86 code and replace __get_cpu_var and get_cpu_var
instances that refer to a scalar and are not used for address
determinations.
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cdac9e5..79d9606 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -981,7 +981,7 @@
if (kvm_tsc_changes_freq())
printk_once(KERN_WARNING
"kvm: unreliable cycle conversion on adjustable rate TSC\n");
- ret = nsec * __get_cpu_var(cpu_tsc_khz);
+ ret = nsec * __this_cpu_read(cpu_tsc_khz);
do_div(ret, USEC_PER_SEC);
return ret;
}
@@ -1066,7 +1066,7 @@
local_irq_save(flags);
kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
kernel_ns = get_kernel_ns();
- this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
+ this_tsc_khz = __this_cpu_read(cpu_tsc_khz);
if (unlikely(this_tsc_khz == 0)) {
local_irq_restore(flags);
@@ -4432,7 +4432,7 @@
static void tsc_bad(void *info)
{
- __get_cpu_var(cpu_tsc_khz) = 0;
+ __this_cpu_write(cpu_tsc_khz, 0);
}
static void tsc_khz_changed(void *data)
@@ -4446,7 +4446,7 @@
khz = cpufreq_quick_get(raw_smp_processor_id());
if (!khz)
khz = tsc_khz;
- __get_cpu_var(cpu_tsc_khz) = khz;
+ __this_cpu_write(cpu_tsc_khz, khz);
}
static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,