linux-kernel - Re: [PATCH] btrfs: Fix -Wunused-but-set-variable warnings

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Date:   Fri, 31 May 2019 13:05:41 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrey Abramov <st5pub@...dex.ru>, clm@...com,
        josef@...icpanda.com, dsterba@...e.com
Cc:     linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: Fix -Wunused-but-set-variable warnings

On Fri, 2019-05-31 at 22:53 +0300, Andrey Abramov wrote:
> Fix -Wunused-but-set-variable warnings in raid56.c and sysfs.c files

trivia:

> diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
> index f3d0576dd327..4ab29eacfdf3 100644
> --- a/fs/btrfs/raid56.c
> +++ b/fs/btrfs/raid56.c
> @@ -1182,22 +1182,17 @@ static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
>  	int nr_data = rbio->nr_data;
>  	int stripe;
>  	int pagenr;
> -	int p_stripe = -1;
> -	int q_stripe = -1;
> +	int is_q_stripe = 0;

These uses seem boolean, so perhaps just use bool?

> +	if (rbio->real_stripes - rbio->nr_data == 2)
> +		is_q_stripe = 1;
[]
> @@ -1241,7 +1236,7 @@ static noinline void finish_rmw(struct btrfs_raid_bio *rbio)
[]
> +		if (is_q_stripe) {
> @@ -2340,8 +2335,7 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
[]
> +	int is_q_stripe = 0;
> @@ -2351,14 +2345,10 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
> +	if (rbio->real_stripes - rbio->nr_data == 2)
> +		is_q_stripe = 1;
[]
> @@ -2380,7 +2370,7 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
[]
> +	if (is_q_stripe) {