linux-kernel - Re: [PATCH] modules: CONFIG_MODULE_COMPRESS: add hint that userspace support may easily be missing.

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Message-ID: <CAPXgP10M6W18VwEvRzc_d1Vk_-zPqo_Y4=nwdh-Nk5v6mujMHA@mail.gmail.com>
Date:	Wed, 3 Jun 2015 19:36:44 +0200
From:	Kay Sievers <kay@...y.org>
To:	Lucas De Marchi <lucas.de.marchi@...il.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Andreas Mohr <andi@...as.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bertrand Jacquin <beber@...eeweb.net>,
	"Marco d'Itri" <md@...ux.it>,
	linux-modules <linux-modules@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>, Jon Masters <jcm@...hat.com>
Subject: Re: [PATCH] modules: CONFIG_MODULE_COMPRESS: add hint that userspace
 support may easily be missing.

On Wed, Jun 3, 2015 at 7:30 PM, Lucas De Marchi
<lucas.de.marchi@...il.com> wrote:
> On Mon, Jun 1, 2015 at 3:26 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
>> Andreas Mohr <andi@...as.de> writes:
>>> Hi,
>>>
>>> I just had a not so nice experience
>>> when finally upgrading to a new 4.1-rc5
>>> with CONFIG_MODULE_COMPRESS newly enabled -
>>> userspace binary parts (kmod 18 or 20 in my case)
>>> did not have compression enabled
>>> (at least on Debian 8pre, vs. encountering it enabled on FC21)
>>> since it does not seem to be
>>> the default build configuration of kmod (yet?).
>>
>> Sure.  Let's get the maintainers to insert the actual version required
>> in the help text though.
>
> kmod supports gz since the first version and xz since version 3.  So both
> of them can be safely fall into "it's supported since the beginning of
> kmod IMO".
>
> Regarding the "default configuration", there's no such thing. Each distribution
> uses a different one.

You could add something similar to this:

$ /usr/lib/systemd/systemd --version
systemd 220
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP
+LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS
+KMOD +IDN

Kay
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