mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 17:01:14 +00:00
5de62ea84a
Make sure to prod idle CPUs so they call klp_update_patch_state(). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Vasily Gorbik <gor@linux.ibm.com> Tested-by: Petr Mladek <pmladek@suse.com> Tested-by: Vasily Gorbik <gor@linux.ibm.com> # on s390 Link: https://lkml.kernel.org/r/20210929151723.162004989@infradead.org
91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_SCHED_IDLE_H
|
|
#define _LINUX_SCHED_IDLE_H
|
|
|
|
#include <linux/sched.h>
|
|
|
|
enum cpu_idle_type {
|
|
CPU_IDLE,
|
|
CPU_NOT_IDLE,
|
|
CPU_NEWLY_IDLE,
|
|
CPU_MAX_IDLE_TYPES
|
|
};
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void wake_up_if_idle(int cpu);
|
|
#else
|
|
static inline void wake_up_if_idle(int cpu) { }
|
|
#endif
|
|
|
|
/*
|
|
* Idle thread specific functions to determine the need_resched
|
|
* polling state.
|
|
*/
|
|
#ifdef TIF_POLLING_NRFLAG
|
|
|
|
static inline void __current_set_polling(void)
|
|
{
|
|
set_thread_flag(TIF_POLLING_NRFLAG);
|
|
}
|
|
|
|
static inline bool __must_check current_set_polling_and_test(void)
|
|
{
|
|
__current_set_polling();
|
|
|
|
/*
|
|
* Polling state must be visible before we test NEED_RESCHED,
|
|
* paired by resched_curr()
|
|
*/
|
|
smp_mb__after_atomic();
|
|
|
|
return unlikely(tif_need_resched());
|
|
}
|
|
|
|
static inline void __current_clr_polling(void)
|
|
{
|
|
clear_thread_flag(TIF_POLLING_NRFLAG);
|
|
}
|
|
|
|
static inline bool __must_check current_clr_polling_and_test(void)
|
|
{
|
|
__current_clr_polling();
|
|
|
|
/*
|
|
* Polling state must be visible before we test NEED_RESCHED,
|
|
* paired by resched_curr()
|
|
*/
|
|
smp_mb__after_atomic();
|
|
|
|
return unlikely(tif_need_resched());
|
|
}
|
|
|
|
#else
|
|
static inline void __current_set_polling(void) { }
|
|
static inline void __current_clr_polling(void) { }
|
|
|
|
static inline bool __must_check current_set_polling_and_test(void)
|
|
{
|
|
return unlikely(tif_need_resched());
|
|
}
|
|
static inline bool __must_check current_clr_polling_and_test(void)
|
|
{
|
|
return unlikely(tif_need_resched());
|
|
}
|
|
#endif
|
|
|
|
static inline void current_clr_polling(void)
|
|
{
|
|
__current_clr_polling();
|
|
|
|
/*
|
|
* Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
|
|
* Once the bit is cleared, we'll get IPIs with every new
|
|
* TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
|
|
* fold.
|
|
*/
|
|
smp_mb(); /* paired with resched_curr() */
|
|
|
|
preempt_fold_need_resched();
|
|
}
|
|
|
|
#endif /* _LINUX_SCHED_IDLE_H */
|