linux-kernel - Re: Kernel 5.5.4 build fail for BPF-selftests with latest LLVM

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Date:   Wed, 19 Feb 2020 19:12:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Andrii Nakryiko <andriin@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        BPF-dev-list <bpf@...r.kernel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <borkmann@...earbox.net>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: Kernel 5.5.4 build fail for BPF-selftests with latest LLVM

On Wed, Feb 19, 2020 at 02:42:54PM +0100, Jesper Dangaard Brouer wrote:
> On Wed, 19 Feb 2020 14:28:56 +0100
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> > On Wed, Feb 19, 2020 at 01:30:12PM +0100, Jesper Dangaard Brouer wrote:
> > > Hi Andrii,
> > > 
> > > Downloaded tarball for kernel release 5.5.4, and I cannot compile
> > > tools/testing/selftests/bpf/ with latest LLVM release version 9.  
> > 
> > Is this something that recently broke?  If so, what commit caused it?
> 
> Digging through, it seems several commits.

'git bisect' is your friend here, can you please use it?

> > And has llvm 9 always worked here?
> 
> Yes, llvm-9 used to work for tools/testing/selftests/bpf/.

As of when?

thanks,

greg k-h