linux-kernel - Re: [PATCH] net: fix SONIC

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Date:	Sun, 04 Jan 2009 22:42:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	roel.kluin@...il.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: fix SONIC_READ definition

From: Roel Kluin <roel.kluin@...il.com>
Date: Sat, 03 Jan 2009 19:43:24 +0100

> drivers/net/jazzsonic.c:56:
> #define SONIC_READ(reg) (*((volatile unsigned int *)dev->base_addr+reg))
> 
> drivers/net/sonic.h:53:
> #define SONIC_CAP0             0x24
> 
> so drivers/net/jazzsonic.c:143:
> val = SONIC_READ(SONIC_CAP0-i);
> 
> becomes
> 
> val = (*((volatile unsigned int *)dev->base_addr+0x24-i));
> 
> That is wrong, isn't it?

The expression, both with and without the parentheses around "reg",
evaluate to the same final pointer value.

Compile a test program and look at the assembler output if you
don't believe me :-)
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