Date: Mon, 24 Apr 2023 16:56:55 +0200
From: Mehdi Djait <mehdi.djait.k@gmail.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: kernel test robot <lkp@intel.com>, jic23@kernel.org,
	mazziesaccount@gmail.com, oe-kbuild-all@lists.linux.dev,
	krzysztof.kozlowski+dt@linaro.org, linux-iio@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v2 5/5] iio: accel: Add support for Kionix/ROHM
 KX132-1211 accelerometer
Message-ID: <ZEaYt3XTzuXrmFxd@carbian>
References: <cef09595632a40eff8a0864fea2e0eb6653930a5.1682019544.git.mehdi.djait.k@gmail.com>
 <202304220729.FCofPRvH-lkp@intel.com>
 <ZEQGqFLIyxm5XENQ@smile.fi.intel.com>
 <ZEWbmSuJqWJWf0aD@carbian>
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In-Reply-To: <ZEWbmSuJqWJWf0aD@carbian>

Hello again,

On Sun, Apr 23, 2023 at 10:57:00PM +0200, Mehdi Djait wrote:
> Hello Andy,
> 
> thank you for the review.
> 
> On Sat, Apr 22, 2023 at 07:09:12PM +0300, Andy Shevchenko wrote:
> > On Sat, Apr 22, 2023 at 07:19:44AM +0800, kernel test robot wrote:
> > > Hi Mehdi,
> > > 
> > > kernel test robot noticed the following build warnings:
> > 
> > I believe it's not just a warning, it's a full functional error in the code.
> > 
> > >    686	{
> > >    687		struct device *dev = regmap_get_device(data->regmap);
> > >    688		__le16 buf_status;
> > >    689		int ret, fifo_bytes;
> > >    690	
> > >    691		ret = regmap_bulk_read(data->regmap, data->chip_info->buf_status1,
> > >    692				       &buf_status, sizeof(buf_status));
> > >    693		if (ret) {
> > >    694			dev_err(dev, "Error reading buffer status\n");
> > >    695			return ret;
> > >    696		}
> > >    697	
> > >  > 698		buf_status &= data->chip_info->buf_smp_lvl_mask;
> > >    699		fifo_bytes = le16_to_cpu(buf_status);
> > 
> > You need to mask in the same endianess space, i.o.w. either on CPU or device side.
> > 
> > I believe you wanted to have fifo_bytes to be masked, but I'm not sure.
> 
> I wanted to read the registers buf_status_1 and buf_status_2 --> 16 bits
> and mask the result of the read to get the bits 0..9 which is the
> buf_status: the number of bytes in the buffer
> 
> This is due to my lack of experience, but I have a question:
> If I don't get any warnings when testing, how should I go about this ? I
> will obviously fix this, but this is for the future.

just ignore this question. I installed sparse and I am using it now when
building. 
 
--
Kind Regards
Mehdi Djait