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linuxkpi: Add cond_resched_lock

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If we need to resched it takes the lock, resched, release the lock
and returns 1, otherwise simply returns 0.

Needed by drm v5.9

MFC after:	1 month
Reviewed by:	hselasky
Sponsored by:	Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D34620
This commit is contained in:
Emmanuel Vadot 2022-03-21 11:14:05 +01:00
parent 31e076d70b
commit 9b8016548e
1 changed files with 13 additions and 0 deletions
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13
sys/compat/linuxkpi/common/include/linux/sched.h
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@ -45,6 +45,7 @@
#include <linux/pid.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/time.h>
#include <asm/atomic.h>
@ -127,6 +128,18 @@ put_task_struct(struct task_struct *task)
#define need_resched() (curthread->td_flags & TDF_NEEDRESCHED)
static inline int
cond_resched_lock(spinlock_t *lock)
{
if (need_resched() == 0)
return (0);
spin_lock(lock);
cond_resched();
spin_unlock(lock);
return (1);
}
bool linux_signal_pending(struct task_struct *task);
bool linux_fatal_signal_pending(struct task_struct *task);
bool linux_signal_pending_state(long state, struct task_struct *task);