Re: [PATCH] kbuild: detect depmod version to exclude new SHA3 module signing options

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On Mon, Jan 15, 2024 at 01:09:25PM +0000, Dimitri John Ledkov wrote:
> On Mon, 15 Jan 2024 at 12:45, Russell King (Oracle)
> <linux@xxxxxxxxxxxxxxx> wrote:
> >
> > Ping?
> >
> 
> The intent is good.
> The implementation is incomplete.
> 
> Please respond or address review feedback emailed previously. See
> https://lore.kernel.org/all/CADWks+Z5iZ=P_OAanA-PiePFbMpwtRe3_dF8wRTak8YAi87zvQ@xxxxxxxxxxxxxx/#t

> Did you test that things are successful wtih kmod 29, 30, 31?

No I didn't. See my comment below the "---" line:

"I don't know what the minimum requirement is for SHA3 to work, so I
have chosen a minimum of version 29 for the purposes of this patch."

> The code to correctly support sha3 in kmod was committed after 31 was
> tagged, and there is no newer tag yet hence the revision that has the
> correct code is v31-6-g510c8b7f74.

Thanks for the information.

> If such check is desired, kmod 32 should be tagged and check should
> check for 32.

"If such a check is desired" ? You mean you prefer systems to segfault
during the installation step when the build system doesn't have a new
enough kmod?

> If possible please use min-tool-version.sh to set the lower bound of
> kmod that is supported by the build. Assuming module signing is
> generally desired to be supported, the minimum required kmod should be
> set to 26. Otherwise at least modinfo doesn't work.

That's a separate issue though, and has build-breaking ramifications.
Enforcing a minimum kmod 26 will mean that the kernel will fail if
kmod isn't new enough, whereas someone may be building with module
signing disabled and thus be fine with older kmod.

These are two separate issues, and I think _this_ _fix_ needs to be
first because the issue is already there and affecting people (me),
and then maybe add the minimum version thing _afterwards_ in case it
needs to be reverted.

Doing it the other way around would make reverting the min-version
thing much harder.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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