linux-kernel - RE: how can we test the hexagon port in mainline

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Message-ID: <08e101d76842$94f78a60$bee69f20$@codeaurora.org>
Date:   Wed, 23 Jun 2021 10:15:19 -0500
From:   "Brian Cain" <bcain@...eaurora.org>
To:     "'Arnd Bergmann'" <arnd@...db.de>
Cc:     "'Christoph Hellwig'" <hch@....de>,
        "'Linus Torvalds'" <torvalds@...ux-foundation.org>,
        "'Sid Manning'" <sidneym@...eaurora.org>,
        "'open list:QUALCOMM HEXAGON...'" <linux-hexagon@...r.kernel.org>,
        "'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>
Subject: RE: how can we test the hexagon port in mainline

> -----Original Message-----
> From: Arnd Bergmann <arnd@...db.de>
> Sent: Wednesday, June 23, 2021 9:54 AM
> To: Brian Cain <bcain@...eaurora.org>
> Cc: Christoph Hellwig <hch@....de>; Linus Torvalds <torvalds@...ux-
> foundation.org>; Sid Manning <sidneym@...eaurora.org>; open
> list:QUALCOMM HEXAGON... <linux-hexagon@...r.kernel.org>; Linux Kernel
> Mailing List <linux-kernel@...r.kernel.org>
> Subject: Re: how can we test the hexagon port in mainline
> 
> On Wed, Jun 23, 2021 at 4:39 PM Brian Cain <bcain@...eaurora.org> wrote:
> >
> > > -----Original Message-----
> > > From: Christoph Hellwig <hch@....de>
> > ...
> > >
> > > Hi all,
> > >
> > > the oldest supported gcc version in mainline is gcc 4.9.  But the only
> > > hexagon crosscompiler I can find is the one Arnds website points to here:
> > >
> > > https://mirrors.edge.kernel.org/pub/tools/crosstool/
> > >
> > > which is a non-upstream gcc 4.6.1 port.  How are we supposed to even
> > > build test hexagon code?
> >
> > We have provided a clang-12-based toolchain here:
> >
> > https://codelinaro.jfrog.io/artifactory/codelinaro-qemu/2021-05-
> 12/clang+llv
> > m-12.0.0-cross-hexagon-unknown-linux-musl.tar.xz
> 
> How close is this to the mainline clang builds from https://apt.llvm.org/?

This is built from llvm-project 12.0.0 but also contains userspace toolchain features like musl and qemu-linux-user for hexagon.  I suppose for the purposes of kernel builds they're equivalent.

> The last time we talked, there were still a couple of bugs that prevented
> me from building an unmodified kernel with an unmodified clang toolchain,
> but I think you planned to address those. Are any changes left that did
> not make it into the 12.0 release?

I think those were identified building with clang 12.0.0 or post-12.0.0, so I don't think they'll be addressed.  Let me review and follow up on the status of those items.  I recall one workaround was to use the integrated assembler to avoid one of the toolchain bugs.

> > Could we update https://mirrors.edge.kernel.org/pub/tools/crosstool/ to
> > point here?
> 
> I'm happy to edit the index page on
> https://mirrors.edge.kernel.org/pub/tools/crosstool,
> but could you provide a stable URL that will keep pointing to the latest
> version
> in the future so I don't have to update it for each new build?

I don't know how to do that with the mechanisms we have so far.  But I will see about getting one created and then hopefully you could use that.

-Brian