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

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Message-ID: <20200219202003.GB2882443@kroah.com>
Date:   Wed, 19 Feb 2020 21:20:03 +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 08:40:39PM +0100, Jesper Dangaard Brouer wrote:
> On Wed, 19 Feb 2020 19:12:50 +0100
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> > 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.    
> > > > 
> [...]
> > > > And has llvm 9 always worked here?  
> > > 
> > > Yes, llvm-9 used to work for tools/testing/selftests/bpf/.  
> > 
> > As of when?
> 
> Kernel v5.4 works when compiling BPF-selftests with LLVM 9.0.1.

Bisection can help us here :)

thanks,

greg k-h