linux-kernel - Re: [PATCH v2] hp100: remove set but not used variable val

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Date:   Tue, 5 Nov 2019 16:50:24 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Chen Wandun <chenwandun@...wei.com>
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        perex@...ex.cz, kstewart@...uxfoundation.org, allison@...utok.net,
        tglx@...utronix.de, joe@...ches.com
Subject: Re: [PATCH v2] hp100: remove set but not used variable val

On Tue, Nov 05, 2019 at 10:36:59PM +0800, Chen Wandun wrote:
> From: Chenwandun <chenwandun@...wei.com>
> 
> Fixes gcc '-Wunused-but-set-variable' warning:
> 
> drivers/staging/hp/hp100.c: In function hp100_start_xmit:
> drivers/staging/hp/hp100.c:1629:10: warning: variable val set but not used [-Wunused-but-set-variable]
> 
> Signed-off-by: Chenwandun <chenwandun@...wei.com>

I need a "full" name here, like the one on your email "From:" line.

> ---
>  drivers/staging/hp/hp100.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/staging/hp/hp100.c b/drivers/staging/hp/hp100.c
> index 6ec78f5..6fc7733 100644
> --- a/drivers/staging/hp/hp100.c
> +++ b/drivers/staging/hp/hp100.c
> @@ -1626,7 +1626,9 @@ static netdev_tx_t hp100_start_xmit(struct sk_buff *skb,
>  	unsigned long flags;
>  	int i, ok_flag;
>  	int ioaddr = dev->base_addr;
> +#ifdef HP100_DEBUG_TX
>  	u_short val;
> +#endif

#ifdefs are not ok in .c code, sorry.

>  	struct hp100_private *lp = netdev_priv(dev);
>  
>  #ifdef HP100_DEBUG_B
> @@ -1695,7 +1697,9 @@ static netdev_tx_t hp100_start_xmit(struct sk_buff *skb,
>  
>  	spin_lock_irqsave(&lp->lock, flags);
>  	hp100_ints_off();
> +#ifdef HP100_DEBUG_TX
>  	val = hp100_inw(IRQ_STATUS);

Are you sure that this doesn't actually change the hardware in some way?

thanks,

greg k-h