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

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Date:   Thu, 2 Mar 2017 23:07:58 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     SIMRAN SINGHAL <singhalsimran0@...il.com>
cc:     Joe Perches <joe@...ches.com>, 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: [Outreachy kernel] Re: [PATCH 3/5] staging: lustre: lustre:
 Remove unnecessary cast on void pointer



On Fri, 3 Mar 2017, SIMRAN SINGHAL wrote:

> On Fri, Mar 3, 2017 at 3:29 AM, Joe Perches <joe@...ches.com> wrote:
> > 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",
> >
>
> I again compiled it and this is what I got :-
>
>   CHK     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CHK     include/generated/timeconst.h
>   CHK     include/generated/bounds.h
>   CHK     include/generated/asm-offsets.h
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   LD      arch/x86/boot/compressed/vmlinux
>   ZOFFSET arch/x86/boot/zoffset.h
>   AS      arch/x86/boot/header.o
>   LD      arch/x86/boot/setup.elf
>   OBJCOPY arch/x86/boot/setup.bin
>   OBJCOPY arch/x86/boot/vmlinux.bin
>   BUILD   arch/x86/boot/bzImage
> Setup is 17500 bytes (padded to 17920 bytes).
> System is 7128 kB
> CRC 37713343
> Kernel: arch/x86/boot/bzImage is ready  (#4)
>   Building modules, stage 2.
>   MODPOST 4541 modules
>
> I am not getting any warning.

Did you touch the .c file before compiling it?  Warnings still allow the
creation of a .o, and once there is a .o that s more recent than the .c,
make won't compile it again.

I got a whole of host of warnings, including the ones Joe showed.

julia

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