Re: [PATCH] KVM: remove pointless cpu hotplug messages

[Christian Borntraeger]

Am 05.05.2015 um 09:39 schrieb Heiko Carstens:
> On cpu hotplug only KVM emits an unconditional message that its notifier
> has been called. It certainly can be assumed that calling cpu hotplug
> notifiers work, therefore there is no added value if KVM prints a message.
> 
> If an error happens on cpu online KVM will still emit a warning.
> 
> So let's remove this superfluous message.
> 
> Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>

Its really the only code that I know of that is chatty on cpu hotplug.

Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>



> ---
>  virt/kvm/kvm_main.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 90977418aeb6..5fb52af5b975 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2882,18 +2882,12 @@ static int hardware_enable_all(void)
>  static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
>  			   void *v)
>  {
> -	int cpu = (long)v;
> -
>  	val &= ~CPU_TASKS_FROZEN;
>  	switch (val) {
>  	case CPU_DYING:
> -		pr_info("kvm: disabling virtualization on CPU%d\n",
> -		       cpu);
>  		hardware_disable();
>  		break;
>  	case CPU_STARTING:
> -		pr_info("kvm: enabling virtualization on CPU%d\n",
> -		       cpu);
>  		hardware_enable();
>  		break;
>  	}
> 

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