Commit 08e2a660 authored by Alexander Sverdlin's avatar Alexander Sverdlin Committed by William Breathitt Gray
Browse files

counter: interrupt-cnt: Convert atomic_t -> atomic_long_t 



Convert the internal counter type to atomic_long_t, which:
- doesn't change much for existing in-tree users as they are 32-bit anyway
  (stm32/i.MX6)
- doesn't introduce performace penalty on 32-bit platforms
- provides 64-bit resolution on 64-bit platforms with virtually no
  preformance penalty

Signed-off-by: default avatarAlexander Sverdlin <alexander.sverdlin@siemens.com>
Acked-by: default avatarOleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20250331152222.2263776-1-alexander.sverdlin@siemens.com


Signed-off-by: default avatarWilliam Breathitt Gray <wbg@kernel.org>
parent b4432656

drivers/counter/interrupt-cnt.c

+4 −4
Original line number Diff line number Diff line
@@ -15,7 +15,7 @@ 
#define INTERRUPT_CNT_NAME "interrupt-cnt"



struct interrupt_cnt_priv {

	atomic_t count;

	atomic_long_t count;

	struct gpio_desc *gpio;

	int irq;

	bool enabled;
@@ -29,7 +29,7 @@ static irqreturn_t interrupt_cnt_isr(int irq, void *dev_id) 
	struct counter_device *counter = dev_id;

	struct interrupt_cnt_priv *priv = counter_priv(counter);



	atomic_inc(&priv->count);

	atomic_long_inc(&priv->count);



	counter_push_event(counter, COUNTER_EVENT_CHANGE_OF_STATE, 0);
@@ -89,7 +89,7 @@ static int interrupt_cnt_read(struct counter_device *counter, 
{

	struct interrupt_cnt_priv *priv = counter_priv(counter);



	*val = atomic_read(&priv->count);

	*val = atomic_long_read(&priv->count);



	return 0;

}
@@ -102,7 +102,7 @@ static int interrupt_cnt_write(struct counter_device *counter, 
	if (val != (typeof(priv->count.counter))val)

		return -ERANGE;



	atomic_set(&priv->count, val);

	atomic_long_set(&priv->count, val);



	return 0;

}