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1da177e4 LT |
1 | #ifndef __LINUX_PREEMPT_H |
2 | #define __LINUX_PREEMPT_H | |
3 | ||
4 | /* | |
5 | * include/linux/preempt.h - macros for accessing and manipulating | |
6 | * preempt_count (used for kernel preemption, interrupt count, etc.) | |
7 | */ | |
8 | ||
9 | #include <linux/config.h> | |
f037360f | 10 | #include <linux/thread_info.h> |
1da177e4 LT |
11 | #include <linux/linkage.h> |
12 | ||
13 | #ifdef CONFIG_DEBUG_PREEMPT | |
14 | extern void fastcall add_preempt_count(int val); | |
15 | extern void fastcall sub_preempt_count(int val); | |
16 | #else | |
17 | # define add_preempt_count(val) do { preempt_count() += (val); } while (0) | |
18 | # define sub_preempt_count(val) do { preempt_count() -= (val); } while (0) | |
19 | #endif | |
20 | ||
21 | #define inc_preempt_count() add_preempt_count(1) | |
22 | #define dec_preempt_count() sub_preempt_count(1) | |
23 | ||
24 | #define preempt_count() (current_thread_info()->preempt_count) | |
25 | ||
26 | #ifdef CONFIG_PREEMPT | |
27 | ||
28 | asmlinkage void preempt_schedule(void); | |
29 | ||
30 | #define preempt_disable() \ | |
31 | do { \ | |
32 | inc_preempt_count(); \ | |
33 | barrier(); \ | |
34 | } while (0) | |
35 | ||
36 | #define preempt_enable_no_resched() \ | |
37 | do { \ | |
38 | barrier(); \ | |
39 | dec_preempt_count(); \ | |
40 | } while (0) | |
41 | ||
42 | #define preempt_check_resched() \ | |
43 | do { \ | |
44 | if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \ | |
45 | preempt_schedule(); \ | |
46 | } while (0) | |
47 | ||
48 | #define preempt_enable() \ | |
49 | do { \ | |
50 | preempt_enable_no_resched(); \ | |
d6f02913 | 51 | barrier(); \ |
1da177e4 LT |
52 | preempt_check_resched(); \ |
53 | } while (0) | |
54 | ||
55 | #else | |
56 | ||
57 | #define preempt_disable() do { } while (0) | |
58 | #define preempt_enable_no_resched() do { } while (0) | |
59 | #define preempt_enable() do { } while (0) | |
60 | #define preempt_check_resched() do { } while (0) | |
61 | ||
62 | #endif | |
63 | ||
64 | #endif /* __LINUX_PREEMPT_H */ |