[PATCH v2 1/6] gpiolib: acpi: Improve struct acpi_gpio_info memory footprint

Andy Shevchenko
2025-04-03T16:00:53Z

The struct acpi_gpio_info has two boolean members that are located
not close to each other making two gaps due to alignment requirements.
Group them to improve memory footprint.

`pahole` difference before and after (on 32-bit):

- /* size: 36, cachelines: 1, members: 9 */
- /* sum members: 30, holes: 2, sum holes: 6 */

+ /* size: 32, cachelines: 1, members: 9 */
+ /* sum members: 30, holes: 1, sum holes: 2 */

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/gpio/gpiolib-acpi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 69caa35c58df..878b11c81c7b 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -96,10 +96,10 @@ struct acpi_gpio_chip {
* @adev: reference to ACPI device which consumes GPIO resource
* @flags: GPIO initialization flags
* @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
+ * @wake_capable: wake capability as provided by ACPI
* @pin_config: pin bias as provided by ACPI
* @polarity: interrupt polarity as provided by ACPI
* @triggering: triggering type as provided by ACPI
- * @wake_capable: wake capability as provided by ACPI
* @debounce: debounce timeout as provided by ACPI
* @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
*/
@@ -107,10 +107,10 @@ struct acpi_gpio_info {
struct acpi_device *adev;
enum gpiod_flags flags;
bool gpioint;
+ bool wake_capable;
int pin_config;
int polarity;
int triggering;
- bool wake_capable;
unsigned int debounce;
unsigned int quirks;
};
--
2.47.2