linux-kernel - Re: [PATCH 1/2] mm: introduce put_user

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Date:   Mon, 9 Jul 2018 18:08:14 +0800
From:   kbuild test robot <lkp@...el.com>
To:     john.hubbard@...il.com
Cc:     kbuild-all@...org, Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Christopher Lameter <cl@...ux.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Jan Kara <jack@...e.cz>, Al Viro <viro@...iv.linux.org.uk>,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH 1/2] mm: introduce put_user_page(), placeholder version

Hi John,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc4 next-20180709]
[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/john-hubbard-gmail-com/mm-fs-put_user_page-proposal/20180709-173653
config: x86_64-randconfig-x015-201827 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the linux-review/john-hubbard-gmail-com/mm-fs-put_user_page-proposal/20180709-173653 HEAD 3f7da023c5e08e49489e39be9cde820b0d1ab4d6 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

>> drivers/platform//goldfish/goldfish_pipe.c:334:13: error: conflicting types for 'release_user_pages'
    static void release_user_pages(struct page **pages, int pages_count,
                ^~~~~~~~~~~~~~~~~~
   In file included from include/linux/scatterlist.h:8:0,
                    from include/linux/dma-mapping.h:11,
                    from drivers/platform//goldfish/goldfish_pipe.c:62:
   include/linux/mm.h:933:20: note: previous definition of 'release_user_pages' was here
    static inline void release_user_pages(struct page **pages,
                       ^~~~~~~~~~~~~~~~~~

vim +/release_user_pages +334 drivers/platform//goldfish/goldfish_pipe.c

726ea1a8 Jin Qian             2017-04-20  333  
726ea1a8 Jin Qian             2017-04-20 @334  static void release_user_pages(struct page **pages, int pages_count,
726ea1a8 Jin Qian             2017-04-20  335  	int is_write, s32 consumed_size)
c89f2750 David 'Digit' Turner 2013-01-21  336  {
726ea1a8 Jin Qian             2017-04-20  337  	int i;
c89f2750 David 'Digit' Turner 2013-01-21  338  
726ea1a8 Jin Qian             2017-04-20  339  	for (i = 0; i < pages_count; i++) {
726ea1a8 Jin Qian             2017-04-20  340  		if (!is_write && consumed_size > 0)
726ea1a8 Jin Qian             2017-04-20  341  			set_page_dirty(pages[i]);
726ea1a8 Jin Qian             2017-04-20  342  		put_page(pages[i]);
726ea1a8 Jin Qian             2017-04-20  343  	}
726ea1a8 Jin Qian             2017-04-20  344  }
726ea1a8 Jin Qian             2017-04-20  345  

:::::: The code at line 334 was first introduced by commit
:::::: 726ea1a8ea96b2bba34ee2073b58f0770800701c goldfish_pipe: An implementation of more parallel pipe

:::::: TO: Jin Qian <jinqian@...roid.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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