linux-kernel - Re: [PATCH v2 5/6] mm: track gup pages with page->dma_pinned

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Message-ID: <4eb75815-9246-3185-d77f-7718e02bef7c@nvidia.com>
Date:   Sun, 1 Jul 2018 22:05:49 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     kbuild test robot <lkp@...el.com>, <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>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] mm: track gup pages with page->dma_pinned_* fields

On 07/01/2018 07:58 PM, kbuild test robot wrote:
> Hi John,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on linus/master]
> [also build test WARNING on v4.18-rc3]
> [cannot apply to next-20180629]
> [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-gup-don-t-unmap-or-drop-filesystem-buffers/20180702-090125
> config: x86_64-randconfig-x010-201826 (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 
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from arch/x86/include/asm/atomic.h:5:0,
>                     from include/linux/atomic.h:5,
>                     from include/linux/page_counter.h:5,
>                     from mm/memcontrol.c:34:
>    mm/memcontrol.c: In function 'unlock_page_lru':
>    mm/memcontrol.c:2087:32: error: 'page_tail' undeclared (first use in this function); did you mean 'page_pool'?
>       VM_BUG_ON_PAGE(PageDmaPinned(page_tail), page);
>                                    ^
Yes, that should have been:

        VM_BUG_ON_PAGE(PageDmaPinned(page), page);

Fixed locally...maybe I'll post a v3 right now, as there were half a dozen ridiculous typos that
snuck in.



thanks,
-- 
John Hubbard
NVIDIA