linux-kernel - Re: [PATCH 3/3] x86, perf, uncore: Don't make MSR uncore depend on PCI uncore

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Message-ID: <alpine.DEB.2.11.1506182304510.4107@nanos>
Date:	Thu, 18 Jun 2015 23:12:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	peterz@...radead.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 3/3] x86, perf, uncore: Don't make MSR uncore depend on
 PCI uncore

On Thu, 18 Jun 2015, Andi Kleen wrote:
>  static int __init intel_uncore_init(void)
>  {
> -	int ret;
> +	int ret1, ret2;
>  
>  	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
>  		return -ENODEV;
> @@ -1295,19 +1297,12 @@ static int __init intel_uncore_init(void)
>  	if (cpu_has_hypervisor)
>  		return -ENODEV;
>  
> -	ret = uncore_pci_init();
> -	if (ret)
> -		goto fail;
> -	ret = uncore_cpu_init();
> -	if (ret) {
> -		uncore_pci_exit();
> -		goto fail;
> +	ret1 = uncore_pci_init();
> +	ret2 = uncore_cpu_init();
> +	if (!ret1 || !ret2) {
> +		uncore_cpumask_init();
> +		uncore_pmus_register();
>  	}
> -	uncore_cpumask_init();
> -
> -	uncore_pmus_register();
>  	return 0;

So now we return success, if nothing is there or stuff failed?

One possible solution is to split the initcall and have one
for uncore_pci and one for uncode_msr, but that does not work well if
you want to make it a module.

But we should at least have some indication, what worked and what went
wrong instead of unconditionally returning success.

Thanks,

	tglx
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