mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#ifndef __LINUX_PREEMPT_H
|
|
#define __LINUX_PREEMPT_H
|
|
|
|
/*
|
|
* include/linux/preempt.h - macros for accessing and manipulating
|
|
* preempt_count (used for kernel preemption, interrupt count, etc.)
|
|
*/
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <linux/linkage.h>
|
|
|
|
#ifdef CONFIG_DEBUG_PREEMPT
|
|
extern void fastcall add_preempt_count(int val);
|
|
extern void fastcall sub_preempt_count(int val);
|
|
#else
|
|
# define add_preempt_count(val) do { preempt_count() += (val); } while (0)
|
|
# define sub_preempt_count(val) do { preempt_count() -= (val); } while (0)
|
|
#endif
|
|
|
|
#define inc_preempt_count() add_preempt_count(1)
|
|
#define dec_preempt_count() sub_preempt_count(1)
|
|
|
|
#define preempt_count() (current_thread_info()->preempt_count)
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
|
|
asmlinkage void preempt_schedule(void);
|
|
|
|
#define preempt_disable() \
|
|
do { \
|
|
inc_preempt_count(); \
|
|
barrier(); \
|
|
} while (0)
|
|
|
|
#define preempt_enable_no_resched() \
|
|
do { \
|
|
barrier(); \
|
|
dec_preempt_count(); \
|
|
} while (0)
|
|
|
|
#define preempt_check_resched() \
|
|
do { \
|
|
if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \
|
|
preempt_schedule(); \
|
|
} while (0)
|
|
|
|
#define preempt_enable() \
|
|
do { \
|
|
preempt_enable_no_resched(); \
|
|
barrier(); \
|
|
preempt_check_resched(); \
|
|
} while (0)
|
|
|
|
#else
|
|
|
|
#define preempt_disable() do { } while (0)
|
|
#define preempt_enable_no_resched() do { } while (0)
|
|
#define preempt_enable() do { } while (0)
|
|
#define preempt_check_resched() do { } while (0)
|
|
|
|
#endif
|
|
|
|
#endif /* __LINUX_PREEMPT_H */
|