linux-kernel - Re: [PATCH] btrfs: Remove redundant initialization of slot

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Date:   Fri, 31 Dec 2021 21:07:45 +0800
From:   Qu Wenruo <quwenruo.btrfs@....com>
To:     Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>, clm@...com
Cc:     josef@...icpanda.com, dsterba@...e.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH] btrfs: Remove redundant initialization of slot



On 2021/12/31 20:23, Jiapeng Chong wrote:
> slot is being initialized to path->slots[0] but this is never
> read as slot is overwritten later on. Remove the redundant
> initialization.
>
> Cleans up the following clang-analyzer warning:
>
> fs/btrfs/tree-log.c:6125:7: warning: Value stored to 'slot' during its
> initialization is never read [clang-analyzer-deadcode.DeadStores].
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
> ---
>   fs/btrfs/tree-log.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index 9165486b554e..c083562a3334 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -6122,7 +6122,7 @@ static int log_new_ancestors(struct btrfs_trans_handle *trans,
>   	while (true) {
>   		struct btrfs_fs_info *fs_info = root->fs_info;
>   		struct extent_buffer *leaf = path->nodes[0];
> -		int slot = path->slots[0];
> +		int slot;

If you're cleaning up slot, then why not also cleaning up leaf?

And again, no feedback no matter what on other patches from you, and
still CC to maintainers.


>   		struct btrfs_key search_key;
>   		struct inode *inode;
>   		u64 ino;