linux-kernel - Re: Help with compiler warning

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Message-ID: <48B17E56.3060106@panasas.com>
Date:	Sun, 24 Aug 2008 18:29:26 +0300
From:	Benny Halevy <bhalevy@...asas.com>
To:	Larry Finger <Larry.Finger@...inger.net>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: Help with compiler warning

On Aug. 22, 2008, 4:36 +0300, Larry Finger <Larry.Finger@...inger.net> wrote:
> In drivers/pcmcia/cardbus.c, the following statement
> 
>          memcpy_fromio(ptr, s->cb_cis_virt + addr, len);
> 
> generates the warning
> 
>    CC [M]  drivers/pcmcia/cardbus.o
> include/asm/io_32.h: In function ‘memcpy_fromio’:
> include/asm/io_32.h:151: warning: passing argument 2 of ‘__memcpy’ 
> discards qualifiers from pointer target type
> 
> s->cb_cis_virt is "void __iomem" and addr is uint.
> 
> What cast does argument 2 need to silence the warning?

memcpy_fromio takes a (const volatile void __iomem *) for the 
src address.

Benny

> 
> Thanks,
> 
> Larry
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