linux-kernel - Re: [PATCH] x86: enable rtc-efi

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Message-Id: <4E142659020000780004C50D@nat28.tlf.novell.com>
Date:	Wed, 06 Jul 2011 08:09:45 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Matthew Garrett" <mjg59@...f.ucam.org>
Cc:	<mingo@...e.hu>, <rtc-linux@...glegroups.com>, <dannf@...com>,
	<tglx@...utronix.de>, <linux-kernel@...r.kernel.org>,
	<hpa@...or.com>
Subject: Re: [PATCH] x86: enable rtc-efi

>>> On 05.07.11 at 20:29, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> On Tue, Jul 05, 2011 at 08:38:51AM +0100, Jan Beulich wrote:
>> Besides a Kconfig change this just requires creating a respective
>> platform device.
> 
> Couple of other issues:
> 
>> +static struct platform_device rtc_efi_dev = {
>> +	.name = "rtc-efi",
>> +	.id = -1,
>> +};
> 
> You haven't removed this from the IA64 code. Isn't that going to result 
> in registering the same device twice?

How would code under arch/ia64/ and code under arch/x86/ ever
manage to register the same device twice?

>> +static int __init rtc_init(void)
>> +{
>> +	if (efi_enabled && platform_device_register(&rtc_efi_dev) < 0)
>> +		printk(KERN_ERR "unable to register rtc device...\n");
> 
> Ought to -ENODEV if efi isn't present? The error message should also be 
> more verbose.

I would agree on the -ENODEV part, but the error message is what
the original ia64 code (which I simply copied over and modified
slightly) has, so if a change is needed it ought to be done there first
I would think. Additionally I can't really see what meaningful addition
to the error message you envision.

Jan

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