linux-kernel - Re: [PATCH] smc91x: fix unused flags warnings on UP systems

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Message-id: <alpine.LFD.2.00.0912090950460.31174@xanadu.home>
Date:	Wed, 09 Dec 2009 09:51:14 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Mike Frysinger <vapier@...too.org>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] smc91x: fix unused flags warnings on UP systems

On Wed, 9 Dec 2009, Mike Frysinger wrote:

> Local flags variables will be declared whenever these functions get used,
> but obviously on UP systems the flags parameter won't be touched.  So add
> some dummy ops that get optimized away anyways to satisfy gcc's warnings.
> 
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Acked-by: Nicolas Pitre <nico@...xnic.net>


> ---
>  drivers/net/smc91x.c |    6 +++---
>  1 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/smc91x.c b/drivers/net/smc91x.c
> index ae4983a..b0c92b6 100644
> --- a/drivers/net/smc91x.c
> +++ b/drivers/net/smc91x.c
> @@ -534,9 +534,9 @@ static inline void  smc_rcv(struct net_device *dev)
>  #define smc_special_lock(lock, flags)		spin_lock_irqsave(lock, flags)
>  #define smc_special_unlock(lock, flags) 	spin_unlock_irqrestore(lock, flags)
>  #else
> -#define smc_special_trylock(lock, flags)	(1)
> -#define smc_special_lock(lock, flags)   	do { } while (0)
> -#define smc_special_unlock(lock, flags)	do { } while (0)
> +#define smc_special_trylock(lock, flags)	(flags == flags)
> +#define smc_special_lock(lock, flags)   	do { flags = 0; } while (0)
> +#define smc_special_unlock(lock, flags)	do { flags = 0; } while (0)
>  #endif
>  
>  /*
> -- 
> 1.6.5.5
> 
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