linux-kernel - Re: [PATCH v4] modules: introduce the MODULE

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Message-ID: <20201218120138.GA5265@linux-8ccs>
Date:   Fri, 18 Dec 2020 13:01:38 +0100
From:   Jessica Yu <jeyu@...nel.org>
To:     Will McVicker <willmcvicker@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Saravana Kannan <saravanak@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v4] modules: introduce the MODULE_SCMVERSION config

+++ Will McVicker [16/12/20 22:08 +0000]:
>Config MODULE_SCMVERSION introduces a new module attribute --
>`scmversion` -- which can be used to identify a given module's SCM
>version.  This is very useful for developers that update their kernel
>independently from their kernel modules or vice-versa since the SCM
>version provided by UTS_RELEASE (`uname -r`) will now differ from the
>module's vermagic attribute.
>
>For example, we have a CI setup that tests new kernel changes on the
>hikey960 and db845c devices without updating their kernel modules. When
>these tests fail, we need to be able to identify the exact device
>configuration the test was using. By including MODULE_SCMVERSION, we can
>identify the exact kernel and modules' SCM versions for debugging the
>failures.
>
>Additionally, by exposing the SCM version via the sysfs node
>/sys/module/MODULENAME/scmversion, one can also verify the SCM versions
>of the modules loaded from the initramfs. Currently, modinfo can only
>retrieve module attributes from the module's ko on disk and not from the
>actual module that is loaded in RAM.
>
>You can retrieve the SCM version in two ways,
>
>1) By using modinfo:
>    > modinfo -F scmversion MODULENAME
>2) By module sysfs node:
>    > cat /sys/module/MODULENAME/scmversion
>
>Signed-off-by: Will McVicker <willmcvicker@...gle.com>

Hi Will, thanks for v4. I'm on vacation for the next two weeks and
with the current merge window almost over, I hope it'd be OK with you
if we revisit this early January. Just wanted to give you a heads up.

Thanks and happy holidays!

Jessica