Backports Archive on lore.kernel.org
 help / color / Atom feed
From: Michal Marek <mmarek@suse.com>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>,
	Cristina Moraru <cristina.moraru09@gmail.com>,
	"vegard.nossum@gmail.com" <vegard.nossum@gmail.com>,
	Valentin Rothberg <valentinrothberg@gmail.com>,
	Hannes Reinecke <hare@suse.de>, Sam Ravnborg <sam@ravnborg.org>
Cc: linux-kernel@vger.kernel.org, teg@jklm.no, kay@vrfy.org,
	rusty@rustcorp.com.au, akpm@linux-foundation.org,
	backports@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"rafael.j.wysocki" <rafael.j.wysocki@intel.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Takashi Iwai <tiwai@suse.de>, Christoph Hellwig <hch@lst.de>,
	Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	Hauke Mehrtens <hauke@hauke-m.de>,
	Paul Bolle <pebolle@tiscali.nl>,
	Paul Gortmaker <paul.gortmaker@windriver.com>,
	Alexey Khoroshilov <khoroshilov@ispras.ru>,
	Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Laurence Oberman <loberman@redhat.com>,
	Johannes Thumshirn <jthumshirn@suse.de>,
	Tejun Heo <tj@kernel.org>,
	Jej B <James.Bottomley@hansenpartnership.com>,
	Theodore Ts'o <tytso@mit.edu>,
	danijons@student.chalmers.se, Andrzej Wasowski <wasowski@itu.dk>
Subject: Re: [RFC PATCH 0/5] Add CONFIG symbol as module attribute
Date: Fri, 19 Aug 2016 11:07:36 +0200
Message-ID: <8e80a77a-7e8f-f5d9-d221-50cddb1926c5@suse.com> (raw)
In-Reply-To: <20160818175505.GM3296@wotan.suse.de>

On 2016-08-18 19:55, Luis R. Rodriguez wrote:
> On Wed, Aug 17, 2016 at 09:26:58PM +0200, Cristina Moraru wrote:
> 
>> This patchset implements dynamic pegging of kconfig symbol
>> into driver modinfo section
> 
> First a little bit of motivation here helps, so let me try to
> help fill in some gaps. This may help explain what you have
> been working on a bit more.
> 
> First, for those that were not Cc'd but curious about this work
> so far, you can read the patches here:
> 
> Original cover letter:
> 
> https://lkml.kernel.org/r/1471462023-119645-1-git-send-email-cristina.moraru09@gmail.com
> 
> https://marc.info/?l=linux-kernel&m=147146213519750&w=2 - patch 1
> https://marc.info/?l=linux-kernel&m=147146209019744&w=2 - patch 2
> https://marc.info/?l=linux-kernel&m=147146211819747&w=2 - patch 3
> https://marc.info/?l=linux-kernel&m=147146209119745&w=2 - patch 4
> https://marc.info/?l=linux-kernel&m=147146209519746&w=2 - patch 5
> 
> There are a few situations in which you may want to extract a
> subset of Kconfig CONFIG_* symbols for a system. At least when
> only considering modules:
> 
>  a) When optimizing build requirements for a kernel for a system.
>     That is you boot into a distro kernel and then want to build
>     a slim kernel only with sensible kernel configuration options.
> 
>  b) When you are on a distribution kernel but the distribution
>     kernel provided lacks hardware support for your device, you
>     may either want to upgrade the full kernel in which case you
>     want to do a) or -- you may want to just a backports release
>     which provides just the modules you need, you'd use it on top
>     of the distribution kernel.

c) Having the mapping in sysfs would allow to simplify
streamline_config.pl avoid parsing Makefiles in perl. Only if the patch
did not depend on streamline_config.pl :). One idea would be to generate
the Module.ksymb in a similar way we generate the modules.builtin file:
Generate an alternate include/config/*.conf with all CONFIG_FOO=m
replaced with

CONFIG_FOO=m-CONFIG_FOO

and in the Makefile, iterate over $(filter m-CONFIG_%, $(.VARIABLES)) to
create the mapping. This would also properly cover cases where we build
the $(obj-m) list from another list. It would certainly create other
corner cases, but it's worth trying IMO.

Another thing is that we do not necessarily need to record this
information in .modinfo, but we can generate a list in
/lib/modules/`uname -r`/ for consumption. It could also include drivers
that are builtin in the current configuration.

Michal
--
To unsubscribe from this list: send the line "unsubscribe backports" in

  reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1471462023-119645-1-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 17:55 ` Luis R. Rodriguez
2016-08-19  9:07   ` Michal Marek [this message]
2016-08-22 19:48     ` Cristina-Gabriela Moraru
2016-08-23 21:32     ` Luis R. Rodriguez
2016-08-24 11:05       ` Michal Marek
2016-08-24 16:33         ` Luis R. Rodriguez
2016-08-24 17:31           ` Naveen Kumar
2016-08-22 19:35   ` Cristina-Gabriela Moraru
2016-08-23 19:17     ` Luis R. Rodriguez
2016-08-25  7:43   ` Christoph Hellwig
2016-08-25  8:00     ` Johannes Berg
2016-08-25 19:51       ` Luis R. Rodriguez
2016-08-25  8:41     ` Michal Marek
2016-08-25 20:19     ` Luis R. Rodriguez
2019-02-05 22:07       ` Luis Chamberlain
2019-06-26 22:21         ` Luis Chamberlain
2019-06-27  4:50           ` Christoph Hellwig
2019-06-28 18:40             ` Luis Chamberlain
2019-06-29  8:42               ` Greg Kroah-Hartman
2019-07-02 20:51                 ` Luis Chamberlain
2019-07-03  7:40                   ` Greg Kroah-Hartman
2019-07-03 16:50                     ` Luis Chamberlain
2019-07-03 18:57                       ` Greg Kroah-Hartman
2019-07-03 22:25                         ` Luis Chamberlain
2019-07-11 23:07                           ` Brendan Higgins
2019-07-11 23:22                             ` Luis Chamberlain
2019-07-03 12:16               ` Enrico Weigelt, metux IT consult
2019-07-03 17:35                 ` Luis Chamberlain
2019-07-03 19:31                   ` Enrico Weigelt, metux IT consult
2019-07-03 22:42                     ` Luis Chamberlain
2019-07-11 23:27                       ` Brendan Higgins
2019-07-13 14:44                         ` Enrico Weigelt, metux IT consult
     [not found] ` <1471462023-119645-3-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 18:10   ` [RFC PATCH 2/5] Add CONFIG symbol to module as compilation parameter Luis R. Rodriguez
2016-08-18 18:55     ` Luis R. Rodriguez
2016-08-20 15:11     ` Cristina-Gabriela Moraru
2016-08-23 19:07       ` Luis R. Rodriguez
     [not found] ` <1471462023-119645-2-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 18:22   ` [RFC PATCH 1/5] Add generation of Module.symb in streamline_config Luis R. Rodriguez
2016-08-18 18:32     ` Luis R. Rodriguez
     [not found]     ` <CAGZ2q2xi9Uy-ye387=mWhy_fOEJBC593Nos7fH027m-_ZdoOXA@mail.gmail.com>
2016-08-20 14:49       ` Cristina-Gabriela Moraru
2016-08-23 19:00       ` Luis R. Rodriguez
     [not found] ` <1471462023-119645-4-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 18:30   ` [RFC PATCH 3/5] Trigger Module.ksymb generation in Makefile Luis R. Rodriguez
     [not found] ` <1471462023-119645-5-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 18:59   ` [RFC PATCH 4/5] Set KCONFIG_KSYMB as value for kconfig_ksymb module attribute Luis R. Rodriguez
2016-08-20 15:16     ` Cristina-Gabriela Moraru
2016-08-23 19:10       ` Luis R. Rodriguez
     [not found] ` <1471462023-119645-6-git-send-email-cristina.moraru09@gmail.com>
2016-08-18 19:02   ` [RFC PATCH 5/5] Add kconf_symb as kernel " Luis R. Rodriguez

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=8e80a77a-7e8f-f5d9-d221-50cddb1926c5@suse.com \
    --to=mmarek@suse.com \
    --cc=James.Bottomley@hansenpartnership.com \
    --cc=akpm@linux-foundation.org \
    --cc=backports@vger.kernel.org \
    --cc=cristina.moraru09@gmail.com \
    --cc=danijons@student.chalmers.se \
    --cc=dmitry.torokhov@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=hare@suse.de \
    --cc=hauke@hauke-m.de \
    --cc=hch@lst.de \
    --cc=johannes@sipsolutions.net \
    --cc=jthumshirn@suse.de \
    --cc=kay@vrfy.org \
    --cc=khoroshilov@ispras.ru \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=loberman@redhat.com \
    --cc=martin.petersen@oracle.com \
    --cc=mcgrof@kernel.org \
    --cc=mchehab@osg.samsung.com \
    --cc=paul.gortmaker@windriver.com \
    --cc=pebolle@tiscali.nl \
    --cc=rafael.j.wysocki@intel.com \
    --cc=rusty@rustcorp.com.au \
    --cc=sam@ravnborg.org \
    --cc=sathya.prakash@broadcom.com \
    --cc=teg@jklm.no \
    --cc=tiwai@suse.de \
    --cc=tj@kernel.org \
    --cc=tytso@mit.edu \
    --cc=valentinrothberg@gmail.com \
    --cc=vegard.nossum@gmail.com \
    --cc=wasowski@itu.dk \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Backports Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/backports/0 backports/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 backports backports/ https://lore.kernel.org/backports \
		backports@vger.kernel.org backports@archiver.kernel.org
	public-inbox-index backports

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.backports


AGPL code for this site: git clone https://public-inbox.org/ public-inbox