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counter: interrupt-cnt: Convert atomic_t -> atomic_long_t

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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: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20250331152222.2263776-1-alexander.sverdlin@siemens.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
This commit is contained in:
Alexander Sverdlin
2025-03-31 17:22:20 +02:00
committed by William Breathitt Gray
parent b4432656b3
commit 08e2a660b1
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/counter/interrupt-cnt.c
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@@ -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;
}