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Date:   Tue, 17 Aug 2021 06:52:18 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Ming Lei <ming.lei@redhat.com>
Cc:     kernel test robot <lkp@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jens Axboe <axboe@kernel.dk>,
        clang-built-linux@googlegroups.com, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 5/7] genirq/affinity: move group_cpus_evenly() into lib/
Message-ID: <20210817045218.GE3874@lst.de>
References: <20210814123532.229494-6-ming.lei@redhat.com> <202108150001.EBuNGcQ8-lkp@intel.com> <YRm5lXfnukXU8Ebh@T590>
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On Mon, Aug 16, 2021 at 09:04:21AM +0800, Ming Lei wrote:
> But the above symbol is exported via EXPORT_SYMBOL_GPL(), in current
> kernel tree, we usually keep such exported symbol as global, or is there
> some change in kernel coding style recently?

This is about prototypes.  You need to include group_cpus.h in
group_cpus.c so that the prototype is visible at the implementation site.