linux-kernel - Re: [PATCH 3/5] staging: lustre: lustre: Remove unnecessary cast on void pointer

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Date:   Thu, 02 Mar 2017 13:59:17 -0800
From:   Joe Perches <joe@...ches.com>
To:     SIMRAN SINGHAL <singhalsimran0@...il.com>
Cc:     Larry.Finger@...inger.net,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        oleg.drokin@...el.com, marvin24@....de,
        outreachy-kernel@...glegroups.com
Subject: Re: [PATCH 3/5] staging: lustre: lustre: Remove unnecessary cast on
 void pointer

On Fri, 2017-03-03 at 03:25 +0530, SIMRAN SINGHAL wrote:
> On Fri, Mar 3, 2017 at 3:13 AM, Joe Perches <joe@...ches.com> wrote:
> > On Fri, 2017-03-03 at 02:49 +0530, simran singhal wrote:
> > > The following Coccinelle script was used to detect this:
> > > @r@
> > > expression x;
> > > void* e;
> > > type T;
> > > identifier f;
> > > @@
> > > (
> > >   *((T *)e)
> > > > 
> > > 
> > >   ((T *)x)[...]
> > > > 
> > > 
> > >   ((T*)x)->f
> > > > 
> > > 
> > > - (T*)
> > >   e
> > > )
> > 
> > NAK.
> > 
> > Nice, but you still have to verify correctness
> > before submitting these patches.
> > 
> > > diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c
> > 
> > []
> > > @@ -1034,7 +1034,7 @@ static int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
> > >               rc = sptlrpc_parse_flavor(val, &flvr);
> > >               if (rc) {
> > >                       CERROR("invalid sptlrpc flavor %s to MGS\n",
> > > -                            (char *)val);
> > > +                            val);
> > 
> > Try compiling this.
> > 
> 
> I compiled it before sending.

Did you look at the warnings?

  CC [M]  drivers/staging/lustre/lustre/mgc/mgc_request.o
drivers/staging/lustre/lustre/mgc/mgc_request.c: In function ‘mgc_set_info_async’:
drivers/staging/lustre/lustre/mgc/mgc_request.c:1036:115: warning: format ‘%s’ expects argument of type ‘char *’, but argument 3 has type ‘void *’ [-Wformat=]
    CERROR("invalid sptlrpc flavor %s to MGS\n",