1 /* thread_info.h: common low-level thread information accessors 2 * 3 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 4 * - Incorporating suggestions made by Linus Torvalds 5 */ 6 7 #ifndef _LINUX_THREAD_INFO_H 8 #define _LINUX_THREAD_INFO_H 9 10 #include <linux/types.h> 11 #include <linux/bug.h> 12 #include <linux/restart_block.h> 13 14 #ifdef CONFIG_THREAD_INFO_IN_TASK 15 /* 16 * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the 17 * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, 18 * including <asm/current.h> can cause a circular dependency on some platforms. 19 */ 20 #include <asm/current.h> 21 #define current_thread_info() ((struct thread_info *)current) 22 #endif 23 24 #include <linux/bitops.h> 25 #include <asm/thread_info.h> 26 27 #ifdef __KERNEL__ 28 29 #ifdef CONFIG_DEBUG_STACK_USAGE 30 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ 31 __GFP_ZERO) 32 #else 33 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) 34 #endif 35 36 /* 37 * flag set/clear/test wrappers 38 * - pass TIF_xxxx constants to these functions 39 */ 40 41 static inline void set_ti_thread_flag(struct thread_info *ti, int flag) 42 { 43 set_bit(flag, (unsigned long *)&ti->flags); 44 } 45 46 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) 47 { 48 clear_bit(flag, (unsigned long *)&ti->flags); 49 } 50 51 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) 52 { 53 return test_and_set_bit(flag, (unsigned long *)&ti->flags); 54 } 55 56 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) 57 { 58 return test_and_clear_bit(flag, (unsigned long *)&ti->flags); 59 } 60 61 static inline int test_ti_thread_flag(struct thread_info *ti, int flag) 62 { 63 return test_bit(flag, (unsigned long *)&ti->flags); 64 } 65 66 #define set_thread_flag(flag) \ 67 set_ti_thread_flag(current_thread_info(), flag) 68 #define clear_thread_flag(flag) \ 69 clear_ti_thread_flag(current_thread_info(), flag) 70 #define test_and_set_thread_flag(flag) \ 71 test_and_set_ti_thread_flag(current_thread_info(), flag) 72 #define test_and_clear_thread_flag(flag) \ 73 test_and_clear_ti_thread_flag(current_thread_info(), flag) 74 #define test_thread_flag(flag) \ 75 test_ti_thread_flag(current_thread_info(), flag) 76 77 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) 78 79 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES 80 static inline int arch_within_stack_frames(const void * const stack, 81 const void * const stackend, 82 const void *obj, unsigned long len) 83 { 84 return 0; 85 } 86 #endif 87 88 #ifdef CONFIG_HARDENED_USERCOPY 89 extern void __check_object_size(const void *ptr, unsigned long n, 90 bool to_user); 91 92 static __always_inline void check_object_size(const void *ptr, unsigned long n, 93 bool to_user) 94 { 95 if (!__builtin_constant_p(n)) 96 __check_object_size(ptr, n, to_user); 97 } 98 #else 99 static inline void check_object_size(const void *ptr, unsigned long n, 100 bool to_user) 101 { } 102 #endif /* CONFIG_HARDENED_USERCOPY */ 103 104 #endif /* __KERNEL__ */ 105 106 #endif /* _LINUX_THREAD_INFO_H */ 107