linux-kernel - Re: [PATCH -next] btrfs: remove unused variable

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Date:   Fri, 27 Nov 2020 20:49:55 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Zou Wei <zou_wei@...wei.com>
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] btrfs: remove unused variable

On Tue, Nov 17, 2020 at 05:47:43PM +0800, Zou Wei wrote:
> Fix variable set but not used compilation warnings:
> 
> fs/btrfs/ctree.c:1581:6: warning: variable ‘parent_level’ set but not used [-Wunused-but-set-variable]
>   int parent_level;
>       ^~~~~~~~~~~~
> 
> fs/btrfs/zoned.c:503:6: warning: variable ‘zone_size’ set but not used [-Wunused-but-set-variable]
>   u64 zone_size;
>       ^~~~~~~~~
> 
> Signed-off-by: Zou Wei <zou_wei@...wei.com>

> ---
>  fs/btrfs/ctree.c | 3 ---
>  fs/btrfs/zoned.c | 2 --
>  2 files changed, 5 deletions(-)
> 
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index 32a57a7..e5a0941 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -1578,13 +1578,10 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
>  	int end_slot;
>  	int i;
>  	int err = 0;
> -	int parent_level;
>  	u32 blocksize;
>  	int progress_passed = 0;
>  	struct btrfs_disk_key disk_key;
>  
> -	parent_level = btrfs_header_level(parent);

That one folded to the patch, thanks.

> -
>  	WARN_ON(trans->transaction != fs_info->running_transaction);
>  	WARN_ON(trans->transid != fs_info->generation);
>  
> diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
> index fa9cc61..742f088 100644
> --- a/fs/btrfs/zoned.c
> +++ b/fs/btrfs/zoned.c
> @@ -500,7 +500,6 @@ int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
>  	unsigned int zone_sectors;
>  	u32 sb_zone;
>  	int ret;
> -	u64 zone_size;
>  	u8 zone_sectors_shift;
>  	sector_t nr_sectors = bdev->bd_part->nr_sects;
>  	u32 nr_zones;
> @@ -515,7 +514,6 @@ int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
>  	zone_sectors = bdev_zone_sectors(bdev);
>  	if (!is_power_of_2(zone_sectors))
>  		return -EINVAL;
> -	zone_size = zone_sectors << SECTOR_SHIFT;

That was intended to be used a few lines below, so that's not for
removal.

>  	zone_sectors_shift = ilog2(zone_sectors);
>  	nr_zones = nr_sectors >> zone_sectors_shift;
>  
> -- 
> 2.6.2