]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/thread_info.h
1 /* thread_info.h: common low-level thread information accessors
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds
7 #ifndef _LINUX_THREAD_INFO_H
8 #define _LINUX_THREAD_INFO_H
10 #include <linux/types.h>
11 #include <linux/bug.h>
12 #include <linux/restart_block.h>
14 #ifdef CONFIG_THREAD_INFO_IN_TASK
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.
20 #include <asm/current.h>
21 #define current_thread_info() ((struct thread_info *)current)
24 #include <linux/bitops.h>
27 * For per-arch arch_within_stack_frames() implementations, defined in
37 #include <asm/thread_info.h>
41 #ifdef CONFIG_DEBUG_STACK_USAGE
42 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
45 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
49 * flag set/clear/test wrappers
50 * - pass TIF_xxxx constants to these functions
53 static inline void set_ti_thread_flag(struct thread_info
*ti
, int flag
)
55 set_bit(flag
, (unsigned long *)&ti
->flags
);
58 static inline void clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
60 clear_bit(flag
, (unsigned long *)&ti
->flags
);
63 static inline int test_and_set_ti_thread_flag(struct thread_info
*ti
, int flag
)
65 return test_and_set_bit(flag
, (unsigned long *)&ti
->flags
);
68 static inline int test_and_clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
70 return test_and_clear_bit(flag
, (unsigned long *)&ti
->flags
);
73 static inline int test_ti_thread_flag(struct thread_info
*ti
, int flag
)
75 return test_bit(flag
, (unsigned long *)&ti
->flags
);
78 #define set_thread_flag(flag) \
79 set_ti_thread_flag(current_thread_info(), flag)
80 #define clear_thread_flag(flag) \
81 clear_ti_thread_flag(current_thread_info(), flag)
82 #define test_and_set_thread_flag(flag) \
83 test_and_set_ti_thread_flag(current_thread_info(), flag)
84 #define test_and_clear_thread_flag(flag) \
85 test_and_clear_ti_thread_flag(current_thread_info(), flag)
86 #define test_thread_flag(flag) \
87 test_ti_thread_flag(current_thread_info(), flag)
89 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
91 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
92 static inline int arch_within_stack_frames(const void * const stack
,
93 const void * const stackend
,
94 const void *obj
, unsigned long len
)
100 #ifdef CONFIG_HARDENED_USERCOPY
101 extern void __check_object_size(const void *ptr
, unsigned long n
,
104 static __always_inline
void check_object_size(const void *ptr
, unsigned long n
,
107 if (!__builtin_constant_p(n
))
108 __check_object_size(ptr
, n
, to_user
);
111 static inline void check_object_size(const void *ptr
, unsigned long n
,
114 #endif /* CONFIG_HARDENED_USERCOPY */
116 extern void __compiletime_error("copy source size is too small")
117 __bad_copy_from(void);
118 extern void __compiletime_error("copy destination size is too small")
121 static inline void copy_overflow(int size
, unsigned long count
)
123 WARN(1, "Buffer overflow detected (%d < %lu)!\n", size
, count
);
126 static __always_inline
bool
127 check_copy_size(const void *addr
, size_t bytes
, bool is_source
)
129 int sz
= __compiletime_object_size(addr
);
130 if (unlikely(sz
>= 0 && sz
< bytes
)) {
131 if (!__builtin_constant_p(bytes
))
132 copy_overflow(sz
, bytes
);
139 check_object_size(addr
, bytes
, is_source
);
143 #ifndef arch_setup_new_exec
144 static inline void arch_setup_new_exec(void) { }
147 #endif /* __KERNEL__ */
149 #endif /* _LINUX_THREAD_INFO_H */