netdev - linux-next: build failure after merge of the net-next tree

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Message-ID: <20180903094702.3e32d8f5@canb.auug.org.au>
Date:   Mon, 3 Sep 2018 09:47:02 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: linux-next: build failure after merge of the net-next tree

Hi all,

After merging the net-next tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

In file included from drivers/net/ethernet/intel/i40e/i40e_ethtool.c:9:
drivers/net/ethernet/intel/i40e/i40e_ethtool.c: In function '__i40e_add_stat_strings':
drivers/net/ethernet/intel/i40e/i40e_ethtool_stats.h:193:20: error: function '__i40e_add_stat_strings' can never be inlined because it uses variable argument lists
 static inline void __i40e_add_stat_strings(u8 **p, const struct i40e_stats stats[],
                    ^~~~~~~~~~~~~~~~~~~~~~~

Caused by commit

  8fd75c58a09a ("i40e: move ethtool stats boiler plate code to i40e_ethtool_stats.h")

It is not clear this patch has any value anyway as the moved functions
are only used in the file they were moved from.

I reverted that commit for today.

The same problem would exist in drivers/net/ethernet/intel/i40evf (where
a lot of code is duplicated from drivers/net/ethernet/intel/i40e) except
that this function is not declared inline there.
Luckily, i40e_ethtool_stats.h is only included my one file
drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c, otherwise there
would be multiple copies of __i40e_add_stat_strings().

Surely there is some scope for factoring out some common code between
these two drivers?
-- 
Cheers,
Stephen Rothwell

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