[v1,1/2] gpiolib: Split fastpath array to two

Message ID 20210525183518.63149-1-andriy.shevchenko@linux.intel.com
State New
Headers show
Series
  • [v1,1/2] gpiolib: Split fastpath array to two
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Commit Message

Andy Shevchenko May 25, 2021, 6:35 p.m.
Split fastpath array to two, i.e. for mask and for bits.
At the same time declare them as bitmaps.

This makes code better to read and gives a clue about use of
bitmap API.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/gpio/gpiolib.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

Comments

Linus Walleij May 28, 2021, 12:40 a.m. | #1
On Tue, May 25, 2021 at 8:35 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:

> Split fastpath array to two, i.e. for mask and for bits.

> At the same time declare them as bitmaps.

>

> This makes code better to read and gives a clue about use of

> bitmap API.

>

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>


Excellent code!

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>


Yours,
Linus Walleij
Bartosz Golaszewski May 28, 2021, 2:16 p.m. | #2
On Tue, May 25, 2021 at 8:35 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>

> Split fastpath array to two, i.e. for mask and for bits.

> At the same time declare them as bitmaps.

>

> This makes code better to read and gives a clue about use of

> bitmap API.

>

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> ---


Applied, thanks!

Bart

Patch

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 97a69362a584..79df075f8b82 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2540,21 +2540,24 @@  int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 
 	while (i < array_size) {
 		struct gpio_chip *gc = desc_array[i]->gdev->chip;
-		unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
+		DECLARE_BITMAP(fastpath_mask, FASTPATH_NGPIO);
+		DECLARE_BITMAP(fastpath_bits, FASTPATH_NGPIO);
 		unsigned long *mask, *bits;
 		int first, j;
 
 		if (likely(gc->ngpio <= FASTPATH_NGPIO)) {
-			mask = fastpath;
+			mask = fastpath_mask;
+			bits = fastpath_bits;
 		} else {
 			mask = kmalloc_array(2 * BITS_TO_LONGS(gc->ngpio),
 					   sizeof(*mask),
 					   can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 			if (!mask)
 				return -ENOMEM;
+
+			bits = mask + BITS_TO_LONGS(gc->ngpio);
 		}
 
-		bits = mask + BITS_TO_LONGS(gc->ngpio);
 		bitmap_zero(mask, gc->ngpio);
 
 		if (!can_sleep)
@@ -2577,7 +2580,7 @@  int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 
 		ret = gpio_chip_get_multiple(gc, mask, bits);
 		if (ret) {
-			if (mask != fastpath)
+			if (mask != fastpath_mask)
 				kfree(mask);
 			return ret;
 		}
@@ -2598,7 +2601,7 @@  int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 						       j);
 		}
 
-		if (mask != fastpath)
+		if (mask != fastpath_mask)
 			kfree(mask);
 	}
 	return 0;
@@ -2823,21 +2826,24 @@  int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 
 	while (i < array_size) {
 		struct gpio_chip *gc = desc_array[i]->gdev->chip;
-		unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)];
+		DECLARE_BITMAP(fastpath_mask, FASTPATH_NGPIO);
+		DECLARE_BITMAP(fastpath_bits, FASTPATH_NGPIO);
 		unsigned long *mask, *bits;
 		int count = 0;
 
 		if (likely(gc->ngpio <= FASTPATH_NGPIO)) {
-			mask = fastpath;
+			mask = fastpath_mask;
+			bits = fastpath_bits;
 		} else {
 			mask = kmalloc_array(2 * BITS_TO_LONGS(gc->ngpio),
 					   sizeof(*mask),
 					   can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 			if (!mask)
 				return -ENOMEM;
+
+			bits = mask + BITS_TO_LONGS(gc->ngpio);
 		}
 
-		bits = mask + BITS_TO_LONGS(gc->ngpio);
 		bitmap_zero(mask, gc->ngpio);
 
 		if (!can_sleep)
@@ -2882,7 +2888,7 @@  int gpiod_set_array_value_complex(bool raw, bool can_sleep,
 		if (count != 0)
 			gpio_chip_set_multiple(gc, mask, bits);
 
-		if (mask != fastpath)
+		if (mask != fastpath_mask)
 			kfree(mask);
 	}
 	return 0;