linux-kernel - Re: [PATCH v2 5/8] gpio: 104-dio-48e: Implement get

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Date:   Sat, 17 Mar 2018 23:47:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     kbuild-all@...org, linus.walleij@...aro.org,
        andy.shevchenko@...il.com, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: Re: [PATCH v2 5/8] gpio: 104-dio-48e: Implement get_multiple callback

Hi William,

I love your patch! Yet something to improve:

[auto build test ERROR on v4.16-rc4]
[also build test ERROR 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/William-Breathitt-Gray/Implement-get_multiple-for-ACCES-and-PC-104-drivers/20180317-224135
config: i386-randconfig-a0-201810 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/gpio/gpio-104-dio-48e.c: In function 'dio48e_gpio_get_multiple':
>> drivers/gpio/gpio-104-dio-48e.c:214:3: error: 'word_mask' undeclared (first use in this function)
      word_mask = mask[word_index] & (port_mask << word_offset);
      ^
   drivers/gpio/gpio-104-dio-48e.c:214:3: note: each undeclared identifier is reported only once for each function it appears in
   drivers/gpio/gpio-104-dio-48e.c:195:16: warning: unused variable 'mask_word' [-Wunused-variable]
     unsigned long mask_word;
                   ^

vim +/word_mask +214 drivers/gpio/gpio-104-dio-48e.c

   184	
   185	static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
   186		unsigned long *bits)
   187	{
   188		struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
   189		size_t i;
   190		const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
   191		const unsigned int gpio_reg_size = 8;
   192		unsigned int bits_offset;
   193		size_t word_index;
   194		unsigned int word_offset;
   195		unsigned long mask_word;
   196		const unsigned long port_mask = GENMASK(gpio_reg_size, 0);
   197		unsigned long port_state;
   198	
   199		/* clear bits array to a clean slate */
   200		bitmap_zero(bits, chip->ngpio);
   201	
   202		/* get bits are evaluated a gpio port register at a time */
   203		for (i = 0; i < ARRAY_SIZE(ports); i++) {
   204			/* gpio offset in bits array */
   205			bits_offset = i * gpio_reg_size;
   206	
   207			/* word index for bits array */
   208			word_index = BIT_WORD(bits_offset);
   209	
   210			/* gpio offset within current word of bits array */
   211			word_offset = bits_offset % BITS_PER_LONG;
   212	
   213			/* mask of get bits for current gpio within current word */
 > 214			word_mask = mask[word_index] & (port_mask << word_offset);
   215			if (!word_mask) {
   216				/* no get bits in this port so skip to next one */
   217				continue;
   218			}
   219	
   220			/* read bits from current gpio port */
   221			port_state = inb(dio48egpio->base + ports[i]);
   222	
   223			/* store acquired bits at respective bits array offset */
   224			bits[word_index] |= port_state << word_offset;
   225		}
   226	
   227		return 0;
   228	}
   229	

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