On Mon, 15 Jan 2018, TimGuo wrote:
> Centaur CPU has a constant frequency TSC and that TSC does not stop in
> C-States.
> But because the flags are not set for that CPU, the TSC is treated as non
> constant
> frequency and assumed to stop in C-States, which makes it an unreliable and
> unusable
> clock source. Setting those flags tells the kernel that the TSC is usable, so
> it
> will select it over HPET. The effect of this is that reading time stamps
> (from kernel
> or userspace) will be faster and more efficient.
>
> Signed-off-by: TimGuo <[email protected]>
> ---
> arch/x86/kernel/cpu/centaur.c | 4 ++++
> drivers/acpi/processor_idle.c | 1 +
> 2 files changed, 5 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
> index 68bc6d9..c578cd2 100644
> --- a/arch/x86/kernel/cpu/centaur.c
> +++ b/arch/x86/kernel/cpu/centaur.c
> @@ -106,6 +106,10 @@ static void early_init_centaur(struct cpuinfo_x86 *c)
> #ifdef CONFIG_X86_64
> set_cpu_cap(c, X86_FEATURE_SYSENTER32);
This is still white space damaged, i.e. TAB is converted to spaces.
Please talk to your IT departement.
Thanks,
tglx
