linux-kernel - Re: [PATCH 1/2] param: allow omitting set() methods for truly read-only params

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Message-ID: <6889404B-C389-4421-BDD7-A042DAAB064A@vmware.com>
Date:	Wed, 11 Aug 2010 00:35:51 -0700
From:	Dmitry Torokhov <dtor@...are.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 1/2] param: allow omitting set() methods for truly
 read-only params

On Aug 10, 2010, at 6:39 PM, "Rusty Russell" <rusty@...tcorp.com.au>  
wrote:

> On Wed, 11 Aug 2010 04:28:44 am Dmitry Torokhov wrote:
>> Certain "parameters", such as acpica version and upcoming VMware  
>> Balloon
>> version, are need to be purely read-only. They are exported as
>> parameters so that they are visible in sysfs even in cases when the
>> module is built directly into the kernel, but their values should be
>> immutable. Specifying S_IRUGO takes care of sysfs interface, but it
>> has no effect on kernel command line or modprobe configuration  
>> files and
>> so these "parameters" attempt to omit set() method. Unfortunately
>> kernel expects set() to be always present and crashes if it is not
>> there, so let's add appropriate check.
>>
>> Signed-off-by: Dmitry Torokhov <dtor@...are.com>
>
> That almost makes sense, but not quite.
>
> Your followup patch uses this for version, but the version is already
> in /sys/module/vmware_balloon/version as is standard with modules, no?
>

That version attribute is not present if the driver is built-in, only  
parameters are visible in both cases.

-- 
Dmitry

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