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smp: limit the scope of some SMP-only functions

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z_smp_init() is only available if CONFIG_SMP is defined,
smp_timer_init() also depends on two Kconfig parameters. Also make it
conditional in cavs_timer.c. Also clarify some SMP-related comments
there.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
This commit is contained in:
Guennadi Liakhovetski 2021-07-15 09:36:45 +02:00 • committed by Christopher Friedt
commit 45b70e1500
2 changed files with 8 additions and 2 deletions
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6
drivers/timer/cavs_timer.c
View file

@ -88,7 +88,7 @@ static void compare_isr(const void *arg)
curr = count();
#ifdef CONFIG_SMP
/* If it has been too long since last_count,
/* If we are too soon since last_count,
* this interrupt is likely the same interrupt
* event but being processed by another CPU.
* Since it has already been processed and
@ -121,6 +121,7 @@ static void compare_isr(const void *arg)
sys_clock_announce(dticks);
}
/* Runs on core 0 only */
int sys_clock_driver_init(const struct device *dev)
{
uint64_t curr = count();
@ -181,7 +182,8 @@ uint32_t sys_clock_cycle_get_32(void)
return count32();
}
#if defined(CONFIG_SMP) && CONFIG_MP_NUM_CPUS > 1
#if defined(CONFIG_SMP) && CONFIG_MP_NUM_CPUS > 1 && !defined(CONFIG_SMP_BOOT_DELAY)
/* Runs on secondary cores */
void smp_timer_init(void)
{
/* This enables the Timer 0 (or 1) interrupt for CPU n.

4
kernel/include/kernel_internal.h
View file

@ -136,9 +136,13 @@ z_thread_return_value_set_with_data(struct k_thread *thread,
thread->base.swap_data = data;
}
#ifdef CONFIG_SMP
extern void z_smp_init(void);
#if CONFIG_MP_NUM_CPUS > 1 && !defined(CONFIG_SMP_BOOT_DELAY)
extern void smp_timer_init(void);
#endif
#endif
extern void z_early_boot_rand_get(uint8_t *buf, size_t length);