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SubjectRe: [PATCH v2 6/8] gpio: 104-idi-48: 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: x86_64-randconfig-x016-201810 (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=x86_64

All errors (new ones prefixed by >>):

drivers/gpio/gpio-104-idi-48.c: In function 'idi_48_gpio_get_multiple':
>> drivers/gpio/gpio-104-idi-48.c:120:3: error: 'word_mask' undeclared (first use in this function); did you mean 'port_mask'?
word_mask = mask[word_index] & (port_mask << word_offset);
^~~~~~~~~
port_mask
drivers/gpio/gpio-104-idi-48.c:120:3: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/gpio/gpio-104-idi-48.c:127:20: error: 'idi48egpio' undeclared (first use in this function); did you mean 'idi48gpio'?
port_state = inb(idi48egpio->base + ports[i]);
^~~~~~~~~~
idi48gpio
drivers/gpio/gpio-104-idi-48.c:101:16: warning: unused variable 'mask_word' [-Wunused-variable]
unsigned long mask_word;
^~~~~~~~~
drivers/gpio/gpio-104-idi-48.c:94:28: warning: unused variable 'idi48gpio' [-Wunused-variable]
struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
^~~~~~~~~

vim +120 drivers/gpio/gpio-104-idi-48.c

90
91 static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
92 unsigned long *bits)
93 {
94 struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
95 size_t i;
96 const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
97 const unsigned int gpio_reg_size = 8;
98 unsigned int bits_offset;
99 size_t word_index;
100 unsigned int word_offset;
101 unsigned long mask_word;
102 const unsigned long port_mask = GENMASK(gpio_reg_size, 0);
103 unsigned long port_state;
104
105 /* clear bits array to a clean slate */
106 bitmap_zero(bits, chip->ngpio);
107
108 /* get bits are evaluated a gpio port register at a time */
109 for (i = 0; i < ARRAY_SIZE(ports); i++) {
110 /* gpio offset in bits array */
111 bits_offset = i * gpio_reg_size;
112
113 /* word index for bits array */
114 word_index = BIT_WORD(bits_offset);
115
116 /* gpio offset within current word of bits array */
117 word_offset = bits_offset % BITS_PER_LONG;
118
119 /* mask of get bits for current gpio within current word */
> 120 word_mask = mask[word_index] & (port_mask << word_offset);
121 if (!word_mask) {
122 /* no get bits in this port so skip to next one */
123 continue;
124 }
125
126 /* read bits from current gpio port */
> 127 port_state = inb(idi48egpio->base + ports[i]);
128
129 /* store acquired bits at respective bits array offset */
130 bits[word_index] |= port_state << word_offset;
131 }
132
133 return 0;
134 }
135

---
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