linux-kernel - Re: linux-next: manual merge of the percpu tree with the ext4 tree

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Date:	Mon, 13 Oct 2014 11:25:33 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Tejun Heo <tj@...nel.org>, Rusty Russell <rusty@...tcorp.com.au>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: linux-next: manual merge of the percpu tree with the ext4 tree

Hi Ted,

On Mon, 8 Sep 2014 16:41:14 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Today's linux-next merge of the percpu tree got a conflict in
> fs/ext4/super.c between commit eb68d0e2fc5a ("ext4: track extent status
> tree shrinker delay statictics") from the ext4 tree and commit
> 908c7f1949cb ("percpu_counter: add @gfp to percpu_counter_init()") from
> the percpu tree.
> 
> I fixed it up (the former removed a reference to percpu_counter_init)
> and can carry the fix as necessary (no action is required).
> 
> That commit also added two references in fs/ext4/extents_status.c (thus
> proving that modifying a little used API causes it to be used
> more :-)), so I added the following merge fix patch:

This patch is now needed when I merge the ext4 tree with Linus'
tree ... so please let Linus know when you send your pull request.

> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Mon, 8 Sep 2014 16:25:46 +1000
> Subject: [PATCH] percpu_counter: fix for ext4 updates
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  fs/ext4/extents_status.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
> index 09fd57667262..3777f7eda5cf 100644
> --- a/fs/ext4/extents_status.c
> +++ b/fs/ext4/extents_status.c
> @@ -13,6 +13,7 @@
>  #include <linux/list_sort.h>
>  #include <linux/proc_fs.h>
>  #include <linux/seq_file.h>
> +#include <linux/gfp.h>
>  #include "ext4.h"
>  #include "extents_status.h"
>  
> @@ -1189,10 +1190,10 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
>  	sbi->s_es_stats.es_stats_cache_misses = 0;
>  	sbi->s_es_stats.es_stats_scan_time = 0;
>  	sbi->s_es_stats.es_stats_max_scan_time = 0;
> -	err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0);
> +	err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0, GFP_KERNEL);
>  	if (err)
>  		return err;
> -	err = percpu_counter_init(&sbi->s_es_stats.es_stats_lru_cnt, 0);
> +	err = percpu_counter_init(&sbi->s_es_stats.es_stats_lru_cnt, 0, GFP_KERNEL);
>  	if (err)
>  		goto err1;
>  

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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