linux-kernel - Re: drivers/net/mac8390.c: Remove useless memcpy casting

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Date:	Sun, 7 Mar 2010 10:19:40 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>
Subject: Re: drivers/net/mac8390.c: Remove useless memcpy casting

On Tue, Mar 2, 2010 at 21:01, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org> wrote:
> Gitweb:     http://git.kernel.org/linus/5c7fffd0e3b57cb63f50bbd710868f012d67654f
> Commit:     5c7fffd0e3b57cb63f50bbd710868f012d67654f
> Parent:     35076402a9936fa8a73b57a1f97fecbeceeec34a
> Author:     Joe Perches <joe@...ches.com>
> AuthorDate: Mon Jan 4 11:53:00 2010 +0000
> Committer:  David S. Miller <davem@...emloft.net>
> CommitDate: Wed Jan 6 20:44:02 2010 -0800
>
>    drivers/net/mac8390.c: Remove useless memcpy casting
>
>    Signed-off-by: Joe Perches <joe@...ches.com>
>    Signed-off-by: David S. Miller <davem@...emloft.net>
> ---
>  drivers/net/mac8390.c |   19 ++++++++++---------
>  1 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/mac8390.c b/drivers/net/mac8390.c
> index 6b6f375..517cee4 100644
> --- a/drivers/net/mac8390.c
> +++ b/drivers/net/mac8390.c
> @@ -237,14 +237,14 @@ static enum mac8390_access __init mac8390_testio(volatile unsigned long membase)

As indicated by the prototype above, membase is not a pointer...

>        unsigned long outdata = 0xA5A0B5B0;
>        unsigned long indata =  0x00000000;
>        /* Try writing 32 bits */
> -       memcpy((char *)membase, (char *)&outdata, 4);
> +       memcpy(membase, &outdata, 4);
>        /* Now compare them */
>        if (memcmp((char *)&outdata, (char *)membase, 4) == 0)
>                return ACCESS_32;
>        /* Write 16 bit output */
> -       word_memcpy_tocard((char *)membase, (char *)&outdata, 4);
> +       word_memcpy_tocard(membase, &outdata, 4);
>        /* Now read it back */
> -       word_memcpy_fromcard((char *)&indata, (char *)membase, 4);
> +       word_memcpy_fromcard(&indata, membase, 4);
>        if (outdata == indata)
>                return ACCESS_16;
>        return ACCESS_UNKNOWN;

... hence you introduced 3 compiler warnings:

drivers/net/mac8390.c:249: warning: passing argument 1 of
'__builtin_memcpy' makes pointer from integer without a cast
drivers/net/mac8390.c:254: warning: passing argument 1 of
'word_memcpy_tocard' makes pointer from integer without a cast
drivers/net/mac8390.c:256: warning: passing argument 2 of
'word_memcpy_fromcard' makes pointer from integer without a cast

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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