linux-kernel - Re: [PATCH 17/21] ext4: remove unnecessary count2 in ext4_free_data_in

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Message-ID: <Y+qV/TF4PJdI3oh/@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date:   Tue, 14 Feb 2023 01:26:45 +0530
From:   Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To:     Kemeng Shi <shikemeng@...weicloud.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/21] ext4: remove unnecessary count2 in
 ext4_free_data_in_buddy

On Fri, Feb 10, 2023 at 03:48:21AM +0800, Kemeng Shi wrote:
> count2 is always 1 in mb_debug, just remove unnecessary count2.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> ---
>  fs/ext4/mballoc.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 289dcd81dd5a..f9fc461b633f 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -3590,7 +3590,7 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
>  {
>  	struct ext4_buddy e4b;
>  	struct ext4_group_info *db;
> -	int err, count = 0, count2 = 0;
> +	int err, count = 0;
>  
>  	mb_debug(sb, "gonna free %u blocks in group %u (0x%p):",
>  		 entry->efd_count, entry->efd_group, entry);
> @@ -3606,7 +3606,6 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
>  	db = e4b.bd_info;
>  	/* there are blocks to put in buddy to make them really free */
>  	count += entry->efd_count;
> -	count2++;
>  	ext4_lock_group(sb, entry->efd_group);
>  	/* Take it out of per group rb tree */
>  	rb_erase(&entry->efd_node, &(db->bb_free_root));
> @@ -3631,8 +3630,7 @@ static void ext4_free_data_in_buddy(struct super_block *sb,
>  	ext4_unlock_group(sb, entry->efd_group);
>  	ext4_mb_unload_buddy(&e4b);
>  
> -	mb_debug(sb, "freed %d blocks in %d structures\n", count,
> -		 count2);
> +	mb_debug(sb, "freed %d blocks in 1 structures\n", count);
>  }
>  
>  /*
> -- 
> 2.30.0
> 
If we always have 1 in the debug message, maybe we can change "structures"
to "structure". Other than that, feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>