Re: [PATCH v3 8/8] watchdog: stpmic1: add stpmic1 watchdog driver

From: kbuild test robot
Date: Mon Oct 08 2018 - 20:47:58 EST


Hi pascal,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on ljones-mfd/for-mfd-next]
[also build test WARNING on v4.19-rc7 next-20181008]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Pascal-PAILLET-LME/Introduce-STPMIC1-PMIC-Driver/20181009-042808
base: https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: ia64-allyesconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=8.1.0 make.cross ARCH=ia64

All warnings (new ones prefixed by >>):

In file included from drivers/watchdog/stpmic1_wdt.c:10:
drivers/watchdog/stpmic1_wdt.c: In function 'pmic_wdt_stop':
>> drivers/watchdog/stpmic1_wdt.c:48:33: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '18446744073709551614' to '4294967294' [-Woverflow]
WCHDG_CR, WDT_START_MASK, ~WDT_START);
include/linux/regmap.h:77:42: note: in definition of macro 'regmap_update_bits'
regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
^~~

vim +48 drivers/watchdog/stpmic1_wdt.c

4
5 #include <linux/kernel.h>
6 #include <linux/mfd/stpmic1.h>
7 #include <linux/module.h>
8 #include <linux/platform_device.h>
9 #include <linux/of.h>
> 10 #include <linux/regmap.h>
11 #include <linux/slab.h>
12 #include <linux/watchdog.h>
13
14 /* WATCHDOG CONTROL REGISTER bit */
15 #define WDT_START BIT(0)
16 #define WDT_PING BIT(1)
17 #define WDT_START_MASK BIT(0)
18 #define WDT_PING_MASK BIT(1)
19
20 #define PMIC_WDT_MIN_TIMEOUT 1
21 #define PMIC_WDT_MAX_TIMEOUT 256
22 #define PMIC_WDT_DEFAULT_TIMEOUT 30
23
24 static bool nowayout = WATCHDOG_NOWAYOUT;
25 module_param(nowayout, bool, 0);
26 MODULE_PARM_DESC(nowayout,
27 "Watchdog cannot be stopped once started (default="
28 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
29
30 struct stpmic1_wdt {
31 struct stpmic1 *pmic;
32 struct watchdog_device wdtdev;
33 };
34
35 static int pmic_wdt_start(struct watchdog_device *wdd)
36 {
37 struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
38
39 return regmap_update_bits(wdt->pmic->regmap,
40 WCHDG_CR, WDT_START_MASK, WDT_START);
41 }
42
43 static int pmic_wdt_stop(struct watchdog_device *wdd)
44 {
45 struct stpmic1_wdt *wdt = watchdog_get_drvdata(wdd);
46
47 return regmap_update_bits(wdt->pmic->regmap,
> 48 WCHDG_CR, WDT_START_MASK, ~WDT_START);
49 }
50

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