netdev - Re: [PATCH net-next] bpf: Remove unused but set variable in __bpf_lru_list_shrink

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Date:   Tue, 10 Jan 2017 16:58:17 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Tobias Klauser <tklauser@...tanz.ch>
CC:     <netdev@...r.kernel.org>, <ast@...nel.org>
Subject: Re: [PATCH net-next] bpf: Remove unused but set variable in
 __bpf_lru_list_shrink_inactive()

On Tue, Jan 10, 2017 at 03:02:07PM +0100, Tobias Klauser wrote:
> Remove the unused but set variable 'first_node' in
> __bpf_lru_list_shrink_inactive() to fix the following GCC warning when
> building with 'W=1':
>
>   kernel/bpf/bpf_lru_list.c:216:41: warning: variable ‘first_node’ set but not used [-Wunused-but-set-variable]
>
> Cc: Martin KaFai Lau <kafai@...com>
> Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>
> ---
>  kernel/bpf/bpf_lru_list.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/kernel/bpf/bpf_lru_list.c b/kernel/bpf/bpf_lru_list.c
> index 89b7ef41c86b..d78501ee0609 100644
> --- a/kernel/bpf/bpf_lru_list.c
> +++ b/kernel/bpf/bpf_lru_list.c
> @@ -213,11 +213,10 @@ __bpf_lru_list_shrink_inactive(struct bpf_lru *lru,
>  			       enum bpf_lru_list_type tgt_free_type)
>  {
>  	struct list_head *inactive = &l->lists[BPF_LRU_LIST_T_INACTIVE];
> -	struct bpf_lru_node *node, *tmp_node, *first_node;
> +	struct bpf_lru_node *node, *tmp_node;
>  	unsigned int nshrinked = 0;
>  	unsigned int i = 0;
>
> -	first_node = list_first_entry(inactive, struct bpf_lru_node, list);
>  	list_for_each_entry_safe_reverse(node, tmp_node, inactive, list) {
>  		if (bpf_lru_node_is_ref(node)) {
>  			__bpf_lru_node_move(l, node, BPF_LRU_LIST_T_ACTIVE);
> --
> 2.11.0
>
>
Thanks for the patch.

Acked-by: Martin KaFai Lau <kafai@...com>