Drop unused support for block aperture, fixing build with kernel 5.18

[kilobyte]

With current userspace kernel headers, the build fails:

/<>/src/os/linux/lnx_system.c: In function ‘get_supported_block_sizes’:
/<>/src/os/linux/lnx_system.c:336:52: error: ‘ND_DEVICE_NAMESPACE_BLK’ undeclared (first use in this function); did you mean ‘ND_DEVICE_NAMESPACE_IO’?
336 | (nstype == ND_DEVICE_NAMESPACE_BLK))
| ^~~~~~~~~~~~~~~~~~~~~~~
| ND_DEVICE_NAMESPACE_IO
compilation terminated due to -Wfatal-errors.
make[3]: *** [CMakeFiles/ipmctl_os_interface.dir/build.make:149: CMakeFiles/ipmctl_os_interface.dir/src/os/linux/lnx_system.c.o] Error 1

As block sizes we fetch have never been used for anything, let's just drop the query.

[StevenPontsler]

Thanks, we will take a look.

[kilobyte]

Here's the original report, BTW.

[StevenPontsler]

The name ND_DEVICE_NAMESPACE_BLK is defined in ndctl.h as is ND_DEVICE_NAMESPACE_IO.

Looking at the report linked to it appears like the file should be coming from one of these packages

Get:87 http://127.0.0.1:12990/debian sid/main amd64 libndctl6 amd64 73-2 [61.8 kB]
Get:88 http://127.0.0.1:12990/debian sid/main amd64 libndctl-dev amd64 73-2 [12.3 kB]

which I believe is
https://packages.debian.org/source/sid/ndctl

looking in http://deb.debian.org/debian/pool/main/n/ndctl/ndctl_73.orig.tar.gz it appears like ND_DEVICE_NAMESPACE_BLK is defined

So I think the code as exists should compile. I am missing something?

[kilobyte]

The define comes from #include <linux/ndctl.h> rather than ndctl/ndctl.h. The former is shipped by linux-libc-dev which already deleted it, rather than by ndctl which had no release that corresponds to 5.18 kernel yet.

But even if ndctl/ndctl.h keeps the historic define, the values queries have never been actually used by ipmctl.

[nolanhergert]

You are correct, we don't expose the values to any external API. Making your change as well as some other sections. It'll take a while, since we need to start the change internally. Thanks!

[kilobyte]

I'll use my patch as-is for Debian packaging then (as maintainers get shouted a lot for "does not build" bugs), you can take your time.

[vynu]

Hello, is this issue going to be fixed any time soon ??

[mikolajkolakowski]

@vynu , we are not planning to spin new version of ipmctl at this time.
What is the rationale for this change to be released?

[kilobyte]

Every downstream project that builds ipmctl from source needs to apply the patch.

For some projects, applying patches is a routine matter, for others it requires tedious manual hacks. But in every case, it's unnecessary work that's multiplied for every downstream.

[nolanhergert]

Done, thanks @kilobyte! Let me know if there is another step I should do.