clocksource/drivers/timer-of: Remove percpu irq related code

GCC's named address space checks errors out with:

drivers/clocksource/timer-of.c: In function ‘timer_of_irq_exit’:
drivers/clocksource/timer-of.c:29:46: error: passing argument 2 of
‘free_percpu_irq’ from pointer to non-enclosed address space
  29 |                 free_percpu_irq(of_irq->irq, clkevt);
     |                                              ^~~~~~
In file included from drivers/clocksource/timer-of.c:8:
./include/linux/interrupt.h:201:43: note: expected ‘__seg_gs void *’
but argument is of type ‘struct clock_event_device *’
 201 | extern void free_percpu_irq(unsigned int, void __percpu *);
     |                                           ^~~~~~~~~~~~~~~
drivers/clocksource/timer-of.c: In function ‘timer_of_irq_init’:
drivers/clocksource/timer-of.c:74:51: error: passing argument 4 of
‘request_percpu_irq’ from pointer to non-enclosed address space
  74 |                                    np->full_name, clkevt) :
     |                                                   ^~~~~~
./include/linux/interrupt.h:190:56: note: expected ‘__seg_gs void *’
but argument is of type ‘struct clock_event_device *’
 190 |                    const char *devname, void __percpu *percpu_dev_id)

Sparse warns about:

timer-of.c:29:46: warning: incorrect type in argument 2 (different address spaces)
timer-of.c:29:46:    expected void [noderef] __percpu *
timer-of.c:29:46:    got struct clock_event_device *clkevt
timer-of.c:74:51: warning: incorrect type in argument 4 (different address spaces)
timer-of.c:74:51:    expected void [noderef] __percpu *percpu_dev_id
timer-of.c:74:51:    got struct clock_event_device *clkevt

It appears the code is incorrect as reported by Uros Bizjak:

"The referred code is questionable as it tries to reuse
the clkevent pointer once as percpu pointer and once as generic
pointer, which should be avoided."

This change removes the percpu related code as no drivers is using it.

[Daniel: Fixed the description]

Fixes: dc11bae785295 ("clocksource/drivers: Add timer-of common init routine")
Reported-by: Uros Bizjak <ubizjak@gmail.com>
Tested-by: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20240819100335.2394751-1-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/timer-of.c b/drivers/clocksource/timer-of.c
index c3f54d9912be7955ecf130c804bd20de29eda339..420202bf76e42c3cfe08d5a47df0e3bcd5211863 100644 (file)
--- a/drivers/clocksource/timer-of.c
+++ b/drivers/clocksource/timer-of.c
@@ -25,10 +25,7 @@ static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
 
        struct clock_event_device *clkevt = &to->clkevt;
 
-       if (of_irq->percpu)
-               free_percpu_irq(of_irq->irq, clkevt);
-       else
-               free_irq(of_irq->irq, clkevt);
+       free_irq(of_irq->irq, clkevt);
 }
 
 /**
@@ -42,9 +39,6 @@ static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
  * - Get interrupt number by name
  * - Get interrupt number by index
  *
- * When the interrupt is per CPU, 'request_percpu_irq()' is called,
- * otherwise 'request_irq()' is used.
- *
  * Returns 0 on success, < 0 otherwise
  */
 static __init int timer_of_irq_init(struct device_node *np,
@@ -69,12 +63,9 @@ static __init int timer_of_irq_init(struct device_node *np,
                return -EINVAL;
        }
 
-       ret = of_irq->percpu ?
-               request_percpu_irq(of_irq->irq, of_irq->handler,
-                                  np->full_name, clkevt) :
-               request_irq(of_irq->irq, of_irq->handler,
-                           of_irq->flags ? of_irq->flags : IRQF_TIMER,
-                           np->full_name, clkevt);
+       ret = request_irq(of_irq->irq, of_irq->handler,
+                         of_irq->flags ? of_irq->flags : IRQF_TIMER,
+                         np->full_name, clkevt);
        if (ret) {
                pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);
                return ret;

diff --git a/drivers/clocksource/timer-of.h b/drivers/clocksource/timer-of.h
index a5478f3e8589df8f1cdc476ce0cf47a00122aca5..01a2c6b7db0659219742cca98401bf065819f6b6 100644 (file)
--- a/drivers/clocksource/timer-of.h
+++ b/drivers/clocksource/timer-of.h
@@ -11,7 +11,6 @@
 struct of_timer_irq {
        int irq;
        int index;
-       int percpu;
        const char *name;
        unsigned long flags;
        irq_handler_t handler;