linux-kernel - Re: linux-next: build failure after merge of the akpm-current tree

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Message-ID: <CALYGNiPBUFBpUXVjgBWYrOX=hi2hhY03owuZ5K27Ljt7BrDEBg@mail.gmail.com>
Date:	Wed, 21 Jan 2015 11:39:18 +0300
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, linux-next@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konstantin Khebnikov <khlebnikov@...dex-team.ru>,
	Christoph Hellwig <hch@....de>
Subject: Re: linux-next: build failure after merge of the akpm-current tree

On Wed, Jan 21, 2015 at 10:29 AM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi Andrew,
>
> After merging the akpm-current tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
>
> mm/page-writeback.c: In function 'account_page_cleared':
> mm/page-writeback.c:2122:23: error: 'struct address_space' has no member named 'backing_dev_info'
>    dec_bdi_stat(mapping->backing_dev_info,
>                        ^
>
> Caused by commit d475bc581640 ("page_writeback: cleanup mess around
> cancel_dirty_page()") (hmm, that commit has no Signed-off-by from
> Andrew?) interacting with commit b83ae6d42143 ("fs: remove
> mapping->backing_dev_info") from the block tree.

Andrew, please drop it. I'll rebase and send it again when the dust settles.

>
> I have applied the following fix patch:
>
> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Wed, 21 Jan 2015 18:23:41 +1100
> Subject: [PATCH] fs: remove mapping->backing_dev_info fix
>
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  mm/page-writeback.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index a8397a6923be..ab922616e522 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2119,7 +2119,7 @@ void account_page_cleared(struct page *page, struct address_space *mapping)
>  {
>         if (mapping_cap_account_dirty(mapping)) {
>                 dec_zone_page_state(page, NR_FILE_DIRTY);
> -               dec_bdi_stat(mapping->backing_dev_info,
> +               dec_bdi_stat(inode_to_bdi(mapping->host),
>                                 BDI_RECLAIMABLE);
>                 task_io_account_cancelled_write(PAGE_CACHE_SIZE);
>         }
> --
> 2.1.4
>
> --
> Cheers,
> Stephen Rothwell                    sfr@...b.auug.org.au
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