linux-kernel - Re: [PATCH 0/3] Implement /proc/built-in file similar to /proc/modules

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Message-ID: <5415E54D.1030908@yandex.ru>
Date:	Sun, 14 Sep 2014 22:58:21 +0400
From:	Kirill Tkhai <tkhai@...dex.ru>
To:	Richard Weinberger <richard.weinberger@...il.com>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Michal Marek <mmarek@...e.cz>, Arnd Bergmann <arnd@...db.de>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ktkhai@...allels.com, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 0/3] Implement /proc/built-in file similar to /proc/modules

On 14.09.2014 22:12, Richard Weinberger wrote:
> On Sun, Sep 14, 2014 at 7:57 PM, Kirill Tkhai <tkhai@...dex.ru> wrote:
>> On 14.09.2014 21:27, Oleg Nesterov wrote:
>>> On 09/14, Greg KH wrote:
>>>>
>>>> On Sun, Sep 14, 2014 at 02:18:13PM +0400, Kirill Tkhai wrote:
>>>>> This series implements a possibility to show the list of built-in drivers
>>>>> to userspace. The names of drivers will be the same as when they are modules.
>>>>
>>>> Have you looked at /sys/modules/ ?  Doesn't that show what you want
>>>> here?
>>>
>>> Well, /sys/module/ doesn't list the modules (drivers) compiled in. Say,
>>> /sys/module/kernel. And it can't help a user to figure out that, say, the
>>> loop driver is already "loaded" because CONFIG_BLK_DEV_LOOP=y.
>>>
>>>> Module names aren't "standardized", we change them at times when needed,
>>>> just like CONFIG_ names.
>>>
>>> OK, but still the name will be the same, in /proc/modules or /proc/builtin.
>>>
>>>> What is your end goal here?  As you say, config.gz is the real kernel
>>>> configuration, just having a list of modules built in isn't going to
>>>> help much in getting a working kernel config without it.
>>>
>>> Perhaps you are right... but otoh perhaps this can can be useful anyway.
>>> Again, a user can know about "insmod loop", but he can know nothing
>>> about CONFIG_ names.
>>>
>>> That said, I do not really understand 2/3. Not only I do not understand
>>> this kbuild magic, I am not sure I understand what /proc/built-in will
>>> actually show.
>>
>> It's a list of drivers, one driver per line:
> 
> Built-in modules or drivers? :-)
> 

It's for boolean CONFIG_XXX too. Some targets have names, not obj-y.
For example, acpi. I did not change them.
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