linux-kernel - Re: [PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned dax mappings

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Message-ID: <201803180613.V0nL0svH%fengguang.wu@intel.com>
Date:   Sun, 18 Mar 2018 06:14:32 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     kbuild-all@...org, linux-nvdimm@...ts.01.org,
        Jan Kara <jack@...e.cz>, Jeff Moyer <jmoyer@...hat.com>,
        Dave Chinner <david@...morbit.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned
 dax mappings

Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc5 next-20180316]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dan-Williams/dax-fix-dma-vs-truncate-hole-punch/20180318-050250
config: x86_64-randconfig-x010-201811 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/dax/super.c: In function 'generic_dax_pagefree':
>> drivers/dax/super.c:170:2: error: implicit declaration of function 'wake_up_var'; did you mean 'wake_up_nr'? [-Werror=implicit-function-declaration]
     wake_up_var(&page->_refcount);
     ^~~~~~~~~~~
     wake_up_nr
   cc1: some warnings being treated as errors

vim +170 drivers/dax/super.c

   166	
   167	#if IS_ENABLED(CONFIG_FS_DAX)
   168	static void generic_dax_pagefree(struct page *page, void *data)
   169	{
 > 170		wake_up_var(&page->_refcount);
   171	}
   172	

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