netdev - Re: netronome/nfp/bpf/jit.c cannot be build with -O3

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Date:   Mon, 6 May 2019 14:00:22 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        oss-drivers@...ronome.com, linux-kernel@...r.kernel.org,
        xdp-newbies@...r.kernel.org, valdis@...edu
Subject: Re: netronome/nfp/bpf/jit.c cannot be build with -O3

On Mon, 06 May 2019 21:40:07 +0200, Oleksandr Natalenko wrote:
> Hi.
> 
> Obligatory disclaimer: building the kernel with -O3 is a non-standard 
> thing done via this patch [1], but I've asked people in #kernelnewbies, 
> and it was suggested that the issue should be still investigated.
> 
> So, with v5.1 kernel release I cannot build the kernel with -O3 anymore. 
> It fails as shown below:

Any chance you could try different compiler versions?  The code in
question does not look too unusual.  Could you try if removing
FIELD_FIT() on line 326 makes a difference?