linux-kernel - Re: [PATCHv2 1/4] gpio: Remove VLA from gpiolib

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Message-ID: <201803172305.wJ5jaEI0%fengguang.wu@intel.com>
Date:   Sat, 17 Mar 2018 23:36:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     kbuild-all@...org, Linus Walleij <linus.walleij@...aro.org>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Lukas Wunner <lukas@...ner.de>,
        Mathias Duckeck <m.duckeck@...bus.de>,
        Nandor Han <nandor.han@...com>,
        Patrice Chotard <patrice.chotard@...com>
Subject: Re: [PATCHv2 1/4] gpio: Remove VLA from gpiolib

Hi Laura,

I love your patch! Perhaps something to improve:

[auto build test WARNING on v4.16-rc4]
[also build test WARNING on next-20180316]
[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/Laura-Abbott/VLA-removal-from-the-gpio-subsystem/20180317-210828
config: i386-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from drivers/clk/clk-gpio.c:18:0:
   include/linux/gpio/consumer.h: In function 'gpiod_set_raw_array_value_cansleep':
>> include/linux/gpio/consumer.h:433:9: warning: 'return' with a value, in function returning void
     return 0;
            ^
   include/linux/gpio/consumer.h:427:20: note: declared here
    static inline void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/return +433 include/linux/gpio/consumer.h

   380	
   381	static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
   382	{
   383		/* GPIO can never have been requested */
   384		WARN_ON(1);
   385		return 0;
   386	}
   387	static inline int gpiod_get_array_value_cansleep(unsigned int array_size,
   388					     struct gpio_desc **desc_array,
   389					     int *value_array)
   390	{
   391		/* GPIO can never have been requested */
   392		WARN_ON(1);
   393		return 0;
   394	}
   395	static inline void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
   396	{
   397		/* GPIO can never have been requested */
   398		WARN_ON(1);
   399	}
   400	static inline void gpiod_set_array_value_cansleep(unsigned int array_size,
   401						    struct gpio_desc **desc_array,
   402						    int *value_array)
   403	{
   404		/* GPIO can never have been requested */
   405		WARN_ON(1);
   406	}
   407	static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
   408	{
   409		/* GPIO can never have been requested */
   410		WARN_ON(1);
   411		return 0;
   412	}
   413	static inline int gpiod_get_raw_array_value_cansleep(unsigned int array_size,
   414						       struct gpio_desc **desc_array,
   415						       int *value_array)
   416	{
   417		/* GPIO can never have been requested */
   418		WARN_ON(1);
   419		return 0;
   420	}
   421	static inline void gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
   422							int value)
   423	{
   424		/* GPIO can never have been requested */
   425		WARN_ON(1);
   426	}
   427	static inline void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
   428							struct gpio_desc **desc_array,
   429							int *value_array)
   430	{
   431		/* GPIO can never have been requested */
   432		WARN_ON(1);
 > 433		return 0;
   434	}
   435	

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