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Date: Fri, 1 Jun 2018 07:13:53 +0200
From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: kbuild test robot <lkp@intel.com>,
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Subject: Re: [vfs:work.aio 10/12] fs/aio.c:1444: undefined reference to
        `ioprio_check_cap'
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References: <201806010845.bDzP7QCW%fengguang.wu@intel.com> <20180601005448.GN30522@ZenIV.linux.org.uk>
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> +extern int ioprio_check_cap(int ioprio);

Which then is implemented in block/ioprio.c, which depends on
CONFIG_BLOCK.  The code either needs a stub for !CONFIG_BLOCK
or moved elsewhere.