123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263 |
- #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 */
|