linux-kernel - Re: [PATCH] hwmon: (pmbus) Expose PEC debugfs attribute

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Message-Id: <1e1dbb10-1628-4498-9ce2-8c4ce79162c8@www.fastmail.com>
Date:   Thu, 10 Sep 2020 20:21:02 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Guenter Roeck" <linux@...ck-us.net>,
        "Dan Carpenter" <dan.carpenter@...cle.com>, kbuild@...ts.01.org,
        linux-hwmon@...r.kernel.org
Cc:     "kbuild test robot" <lkp@...el.com>, kbuild-all@...ts.01.org,
        "Jean Delvare" <jdelvare@...e.com>, openbmc@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (pmbus) Expose PEC debugfs attribute



On Thu, 10 Sep 2020, at 20:04, Guenter Roeck wrote:
> On 9/10/20 3:05 AM, Dan Carpenter wrote:
> > Hi Andrew,
> > 
> > url:    https://github.com/0day-ci/linux/commits/Andrew-Jeffery/hwmon-pmbus-Expose-PEC-debugfs-attribute/20200910-010642
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
> > config: x86_64-randconfig-m001-20200909 (attached as .config)
> > compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> > 
> > smatch warnings:
> > drivers/hwmon/pmbus/pmbus_core.c:2415 pmbus_debugfs_ops_pec_open() warn: '0x' prefix is confusing together with '%1llu' specifier
> > 
> > # https://github.com/0day-ci/linux/commit/705b8b5588d4102256d0954086ed16c9bdf9804f
> > git remote add linux-review https://github.com/0day-ci/linux
> > git fetch --no-tags linux-review Andrew-Jeffery/hwmon-pmbus-Expose-PEC-debugfs-attribute/20200910-010642
> > git checkout 705b8b5588d4102256d0954086ed16c9bdf9804f
> > vim +2415 drivers/hwmon/pmbus/pmbus_core.c
> > 
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2391  static int pmbus_debugfs_set_pec(void *data, u64 val)
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2392  {
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2393  	int rc;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2394  	struct i2c_client *client = data;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2395  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2396  	if (!val) {
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2397  		client->flags &= ~I2C_CLIENT_PEC;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2398  		return 0;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2399  	}
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2400  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2401  	if (val != 1)
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2402  		return -EINVAL;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2403  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2404  	rc = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2405  	if (rc < 0)
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2406  		return rc;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2407  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2408  	if (!(rc & PB_CAPABILITY_ERROR_CHECK))
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2409  		return -ENOTSUPP;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2410  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2411  	client->flags |= I2C_CLIENT_PEC;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2412  
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2413  	return 0;
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2414  }
> > 705b8b5588d410 Andrew Jeffery 2020-09-09 @2415  DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_pec, pmbus_debugfs_get_pec,
> > 705b8b5588d410 Andrew Jeffery 2020-09-09  2416  			 pmbus_debugfs_set_pec, "0x%1llu\n");
> >                                                                                                  ^^^^^^^
> > Was the 1 intentional?  Anyway, you probably want to remove the 0x so
> > it doesn't look like hex.
> > 
> 
> Nice catch; I didn't notice the 1. It is still there in v2, but it does 
> seem quite useless.

Do you want to just rebase it out, or would you like me to send
a patch removing the stray 1 from v2?

Andrew