netdev - Re: [PATCH] Re:[BUILD FAILURE 04/04] Next June 04:PPC64 randconfig [drivers/net/ucc

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Message-Id: <1244685791.4674.12.camel@concordia>
Date:	Thu, 11 Jun 2009 12:03:11 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	subrata@...ux.vnet.ibm.com
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>, netdev@...r.kernel.org,
	Li Yang <leoli@...escale.com>,
	Sachin P Sant <sachinp@...ux.vnet.ibm.com>,
	Linuxppc-dev <Linuxppc-dev@...abs.org>,
	Linux-Next <linux-next@...r.kernel.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Re:[BUILD FAILURE 04/04] Next June 04:PPC64 randconfig
 [drivers/net/ucc_geth.o]

On Thu, 2009-06-11 at 07:26 +0530, Subrata Modak wrote:
> On Thu, 2009-06-11 at 11:05 +1000, Stephen Rothwell wrote:
> > Hi Subrata,
> > 
> > On Wed, 10 Jun 2009 23:13:23 +0530 Subrata Modak <subrata@...ux.vnet.ibm.com> wrote:
> > >
> > >  	/* Find the TBI PHY.  If it's not there, we don't support SGMII */
> > > -	ph = of_get_property(np, "tbi-handle", NULL);
> > > +	ph = (phandle *)of_get_property(np, "tbi-handle", NULL);
> > 
> > You don't need this cast because of_get_property() returns "void *".
> 
> Stephen,
> 
> True. But without this gcc complains:
> 
> CC [M]  drivers/net/ucc_geth.o
> drivers/net/ucc_geth.c: In function ‘ucc_geth_probe’:
> drivers/net/ucc_geth.c:3824: warning: assignment discards qualifiers from pointer target type
                                                           ^^^^^^^^^^^

And what does that warning actually mean?

Your cast actually introduces a bug.

cheers

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