linux-kernel - Re: [PATCH v2 0/2] Adds support to capture module's SCM version

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Message-ID: <X8mEhIeYeMjZc/+7@google.com>
Date:   Thu, 3 Dec 2020 16:36:20 -0800
From:   William Mcvicker <willmcvicker@...gle.com>
To:     Jessica Yu <jeyu@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     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 v2 0/2] Adds support to capture module's SCM version

On Wed, Nov 25, 2020 at 01:05:39AM +0000, Will McVicker wrote:
> Hi All,
> 
> I have updated the patchset to:
> 
>  *) Include Documentation.
>  *) Use a consistent output pattern for the SCM version.
> 
> In my debugging, I found that the vermagic reported by modinfo can actually
> vary based on how the module was loaded. For example, if you have a module in
> the initramfs that is newer than the module on disk, then the initramfs module
> will be loaded (not the one on disk) during boot. Then, when you run the
> command:
> 
>   $ modinfo MODULENAME
> 
> The vermagic returned will actually be the vermagic of the module on disk and
> not the one in the initramfs which was actually loaded. With that being said,
> adding this scmversion attribute ensures that you can *always* get the correct
> SCM version of the module that loaded.
> 
> Please take a look at the updated patch and provide any comments you find.
> 
> Thanks,
> Will
> 
> Will McVicker (2):
>   scripts/setlocalversion: allow running in a subdir
>   modules: add scmversion field
> 
>  Documentation/ABI/stable/sysfs-module | 17 +++++++++++++++++
>  include/linux/module.h                |  1 +
>  kernel/module.c                       |  2 ++
>  scripts/Makefile.modpost              | 20 ++++++++++++++++++++
>  scripts/mod/modpost.c                 | 24 +++++++++++++++++++++++-
>  scripts/setlocalversion               |  5 ++---
>  6 files changed, 65 insertions(+), 4 deletions(-)
> 
> -- 
> 2.29.2.454.gaff20da3a2-goog
> 
Hi Jessica, Masahiro, and Michal,

Friendly reminder :)

Thanks,
Will