linux-kernel - Re: [RFC 02/11] ext4: Remove unused extern variables declaration

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Message-ID: <20230309113732.3l6opu5qe5teqn74@quack3>
Date:   Thu, 9 Mar 2023 12:37:32 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ojaswin Mujoo <ojaswin@...ux.ibm.com>
Cc:     linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Ritesh Harjani <riteshh@...ux.ibm.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>, Ritesh Harjani <ritesh.list@...il.com>
Subject: Re: [RFC 02/11] ext4: Remove unused extern variables declaration

On Fri 27-01-23 18:07:29, Ojaswin Mujoo wrote:
> ext4_mb_stats & ext4_mb_max_to_scan are never used. We use
> sbi->s_mb_stats and sbi->s_mb_max_to_scan instead.
> Hence kill these extern declarations.
> 
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
> Signed-off-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>

Nice. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/ext4.h    | 2 --
>  fs/ext4/mballoc.h | 2 +-
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 140e1eb300d1..b8b00457da8d 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2903,8 +2903,6 @@ int ext4_fc_record_regions(struct super_block *sb, int ino,
>  /* mballoc.c */
>  extern const struct seq_operations ext4_mb_seq_groups_ops;
>  extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
> -extern long ext4_mb_stats;
> -extern long ext4_mb_max_to_scan;
>  extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
>  extern int ext4_mb_init(struct super_block *);
>  extern int ext4_mb_release(struct super_block *);
> diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
> index dcda2a943cee..165a17893c81 100644
> --- a/fs/ext4/mballoc.h
> +++ b/fs/ext4/mballoc.h
> @@ -49,7 +49,7 @@
>  #define MB_DEFAULT_MIN_TO_SCAN		10
>  
>  /*
> - * with 'ext4_mb_stats' allocator will collect stats that will be
> + * with 's_mb_stats' allocator will collect stats that will be
>   * shown at umount. The collecting costs though!
>   */
>  #define MB_DEFAULT_STATS		0
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR