linux-kernel - Re: [Intel-wired-lan] [net-next PATCH] ixgbevf: fix unused variable warning

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Message-ID: <CAKgT0UcgjKeFoy0nm70CP+EshSccGgAqsq6gtwsMqdvqM6CSWg@mail.gmail.com>
Date:   Fri, 2 Mar 2018 12:55:09 -0800
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [net-next PATCH] ixgbevf: fix unused variable warning

On Wed, Feb 28, 2018 at 3:17 PM, Arnd Bergmann <arnd@...db.de> wrote:
> The new ixgbevf_set_rx_buffer_len() function causes a harmless warnings
> in configurations with large page size:
>
> drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function 'ixgbevf_set_rx_buffer_len':
> drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:1758:15: error: unused variable 'max_frame' [-Werror=unused-variable]
>
> This rephrases the code so that the compiler can see the use of that
> variable, making it slightly easier to read in the process.
>
> Fixes: f15c5ba5b6cd ("ixgbevf: add support for using order 1 pages to receive large frames")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> index f37307131eb6..4da449e0a4ba 100644
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -1766,12 +1766,12 @@ static void ixgbevf_set_rx_buffer_len(struct ixgbevf_adapter *adapter,
>
>         set_ring_build_skb_enabled(rx_ring);
>
> -#if (PAGE_SIZE < 8192)
> -       if (max_frame <= IXGBEVF_MAX_FRAME_BUILD_SKB)
> -               return;
> +       if (PAGE_SIZE < 8192) {
> +               if (max_frame <= IXGBEVF_MAX_FRAME_BUILD_SKB)
> +                       return;
>
> -       set_ring_uses_large_buffer(rx_ring);
> -#endif
> +               set_ring_uses_large_buffer(rx_ring);
> +       }
>  }
>
>  /**

The fix looks good to me.

Acked-by: Alexander Duyck <alexander.h.duyck@...el.com>