linux-kernel - RE: [PATCH V6 4/7] mfd: da9061: MFD core support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6ED8E3B22081A4459DAC7699F3695FB7018CD6A1E1@SW-EX-MBX02.diasemi.com>
Date:   Tue, 28 Mar 2017 11:24:29 +0000
From:   Steve Twiss <stwiss.opensource@...semi.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Lee Jones <lee.jones@...aro.org>,
        kbuild test robot <lkp@...el.com>,
        "kbuild-all@...org" <kbuild-all@...org>,
        LINUX-KERNEL <linux-kernel@...r.kernel.org>,
        DEVICETREE <devicetree@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        LINUX-INPUT <linux-input@...r.kernel.org>,
        LINUX-PM <linux-pm@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Support Opensource <Support.Opensource@...semi.com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Zhang Rui <rui.zhang@...el.com>
Subject: RE: [PATCH V6 4/7] mfd: da9061: MFD core support

On 28 March 2017 11:51, Geert Uytterhoeven wrote:
> Hi Steve,
> 
> On Tue, Mar 28, 2017 at 12:42 PM, Steve Twiss wrote:
> > On 28 March 2017 09:37, Geert Uytterhoeven wrote:
> >> Subject: Re: [PATCH V6 4/7] mfd: da9061: MFD core support
> >> On Tue, Mar 28, 2017 at 10:21 AM, Lee Jones <lee.jones@...aro.org> wrote:
> >> >> [auto build test WARNING on ljones-mfd/for-mfd-next]
> >> >> [also build test WARNING on v4.11-rc4 next-20170327]
> >> >> base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
> >> >> config: x86_64-randconfig-x009-201713 (attached as .config)
> >> >> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> >> >> reproduce:
> >> >>         # save the attached .config to linux build tree
> >> >>         make ARCH=x86_64
> >> >>
> >> >> All warnings (new ones prefixed by >>):
> >> >>
> >> >>    drivers//mfd/da9062-core.c: In function 'da9062_i2c_probe':
> >> >> >> drivers//mfd/da9062-core.c:845:21: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
> >> >>       chip->chip_type = (int)match->data;
> >> >>                        ^
> >> >
> >> > Please use longs or enums.
> >>
> >> Enums would still give a warning on 64-bit.
> >> The simple fix is change the cast from (int) to (uintptr_t).
> >
> > Hi Lee and Geert,
> >
> > How about this? Fix by redefining the enum chip_type to be an int.
> > Then, just use substitution:
> > #define COMPAT_TYPE_DA9061  1
> > #define COMPAT_TYPE_DA9062  2
> >
> > That would be simple.
> > Are there any reasons this would not be acceptable?
> 
> I don't see how that can help.
> The warning is caused by casting the "void *" (which is either 32-bit or
> 64-bit) in of_device_if.data to an integer or enum (which is always 32-bit).
> 
> The right fix is to cast it to uintptr_t intead of int, like other drivers do.

Thanks Geert,
Um. Of course. Thanks, and my apologies. It would have helped if I had compile tested the right file  :(
I'll follow the convention and cast (uintptr_t).
Thanks,
Steve