linux-kernel - Re: [PATCH v2 1/1] mfd: intel_quark_i2c_gpio: Don't play dirty trick with const

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Date:   Wed, 14 Apr 2021 18:13:19 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 1/1] mfd: intel_quark_i2c_gpio: Don't play dirty trick
 with const

On Fri, 26 Mar 2021, Lee Jones wrote:

> On Fri, 26 Mar 2021, Andy Shevchenko wrote:
> 
> > As Linus rightfully noticed, the driver plays dirty trick with const,
> > i.e. it assigns a place holder data structure to the const field
> > in the MFD cell and then drops the const by explicit casting. This is
> > not how it should be.
> > 
> > Assign local pointers of the cell and resource to the respective
> > non-const place holders in the intel_quark_i2c_setup() and
> > intel_quark_gpio_setup().
> > 
> > Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> > v2: eliminated bar parameter (Lee)
> >  drivers/mfd/intel_quark_i2c_gpio.c | 26 ++++++++++++--------------
> >  1 file changed, 12 insertions(+), 14 deletions(-)
> 
> Neat.
> 
> Applied, thanks.

Am I still missing patches from you Andy?

I get:

 make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'CC=sccache x86_64-linux-gnu-gcc' 'HOSTCC=sccache gcc' allmodconfig
 make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/1/tmp ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- 'CC=sccache x86_64-linux-gnu-gcc' 'HOSTCC=sccache gcc'
 /builds/linux/drivers/mfd/intel_quark_i2c_gpio.c: In function 'intel_quark_i2c_setup':
 /builds/linux/drivers/mfd/intel_quark_i2c_gpio.c:181:25: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
   struct resource *res = intel_quark_i2c_res;
                          ^~~~~~~~~~~~~~~~~~~
 /builds/linux/drivers/mfd/intel_quark_i2c_gpio.c: In function 'intel_quark_gpio_setup':
 /builds/linux/drivers/mfd/intel_quark_i2c_gpio.c:203:25: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
   struct resource *res = intel_quark_gpio_res;
                          ^~~~~~~~~~~~~~~~~~~~

Link to the build (see: build.log):

  https://builds.tuxbuild.com/1rAMovpd041jvsjfQ538kW3nvYK/

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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