v2.x: opal: add support for s390 and s390x architectures

[nmorey]

Signed-off-by: Nicolas Morey-Chaisemartin [email protected]

[ompiteam-bot]

Can one of the admins verify this patch?

[jsquyres]

@nmorey The intent for this PR is to enable Vader's CMA support to compile on S390[X] platforms, is that correct? Note that we usually commit such fixes to master first, and then cherry-pick them to the relevant release branches. Can you open a corresponding PR against master?

@bosilca @hjelmn Can you have a quick look? Looks fairly straightforward.

[jsquyres]

Cross-reference: #3443

[nmorey]

@jsquyres Yes. I had to fix 2.1.0 build for SUSE so I sent the patch as is but I can probably port it to master.

[jsquyres]

@nmorey Excellent; thanks!

[bwbarrett]

@jsquyres, we shouldn't merge this patch to 2.x until it's 1) in master and 2) there's a PR to 3.x as well...

[nmorey]

@bwbarrett I'll do one for 3.x once master gets accepted then :)

[bwbarrett]

@nmorey: yes, the usual path for PRs in Open MPI is master then to the branches. @jsquyres, @hppritcha, and I are currently trying to make sure that we don't accidentally ship something in 2.1, but then not in 3.0, so the comment was as much for us as anyone :).

[jsquyres]

#3454 was just merged to master; it is a slightly updated version of this PR (i.e., added a comment).

[jsquyres]

@hppritcha Do you have an opinion on whether this should go to v2.1.1 or v2.1.2?

[jsquyres]

Corresponding master PR: #3454

[jsquyres]

Per discussion with @bwbarrett, this will go into v3.x, so let's go ahead and take this in v2.x.