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Date:   Fri, 23 Jul 2021 09:04:19 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: linux-next: build failure in Linus' tree

Hi all,

On Tue, 20 Jul 2021 14:11:01 +0200 Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 20 Jul 2021 16:45:31 +1000, Stephen Rothwell wrote:
> > 
> > On Thu, 15 Jul 2021 09:50:32 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > >
> > > While compiling Linus' tree, a powerpc-allmodconfig build (and others)
> > > with gcc 4.9 failed like this:
> > > 
> > > drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c: In function 'ifh_encode_bitfield':
> > > include/linux/compiler_types.h:328:38: error: call to '__compiletime_assert_431' declared with attribute error: Unsupported width, must be <= 40
> > >   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> > >                                       ^
> > > include/linux/compiler_types.h:309:4: note: in definition of macro '__compiletime_assert'
> > >     prefix ## suffix();    \
> > >     ^
> > > include/linux/compiler_types.h:328:2: note: in expansion of macro '_compiletime_assert'
> > >   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> > >   ^
> > > drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c:28:2: note: in expansion of macro 'compiletime_assert'
> > >   compiletime_assert(width <= 40, "Unsupported width, must be <= 40");
> > >   ^
> > > 
> > > Caused by commit
> > > 
> > >   f3cad2611a77 ("net: sparx5: add hostmode with phylink support")
> > > 
> > > I guess this is caused by the call to ifh_encode_bitfield() not being
> > > inlined.    
> > 
> > I am still getting these failures.  
> 
> Bjarni, Steen, could you address this build failure ASAP?
> 
> We can't have a compile time asserts in static functions, if the code
> is optimized for size chances are the function won't get inlined. clang
> is pretty bad at propagating constants to compile time asserts, too.
> Please remove this check, or refactor it to be done in a macro, or ..

I am still getting these failures.

-- 
Cheers,
Stephen Rothwell

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