linux-kernel - Re: [PATCH] fix "passing argument # of '__memcpy' discards qualifiers from pointer target type" warnings

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Date:	Wed, 24 Oct 2007 16:35:01 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"Bodo Eggert" <7eggert@....de>
Cc:	Miguel Botón <mboton.lkml@...il.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix "passing argument # of '__memcpy' discards qualifiers from pointer target type" warnings

On Wed, 24 Oct 2007, Bodo Eggert wrote:

> Miguel Botón <mboton.lkml@...il.com> wrote:
>
>> This patch fixes the warnings "passing argument 1 of '__memcpy' discards
>> qualifiers from pointer target type" and "passing argument 2 of '__memcpy'
>> discards qualifiers from pointer target type" when compiling some files.
>>
>> I don't really know if this is the best way but at least I don't get more
>> warnings.
>
>> +++ linux-2.6.24-rc1/fs/cifs/dir.c    2007-10-24 15:49:44.000000000 +0200
>> @@ -585,6 +585,7 @@
>
>> +     unsigned char *dstname = (unsigned char *)a->name;
>
>> @@ -593,7 +594,7 @@
>
>> -             memcpy((unsigned char *)a->name, b->name, a->len);
>> +             memcpy(dstname, b->name, a->len);
>
> This looks like a compiler bug. Get the gcc people to fix it.
> -- 
> Top 100 things you don't want the sysadmin to say:
> 20. ...and if we just swap these two disc controllers like _this_...
>
> Friß, Spammer: wd@....7eggert.dyndns.org esmpv@....7eggert.dyndns.org
> -

According to the header, the pointer is a (const struct qstr *). Not
a gcc bug if somebody is writing there. Probably the header needs
fixing.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.59 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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