Re: [PATCH v4] modules: introduce the MODULE_SCMVERSION config

[Jessica Yu]

+++ 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@xxxxxxxxxx>

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