| /* thread_info.h: common low-level thread information accessors |
| * |
| * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| * - Incorporating suggestions made by Linus Torvalds |
| */ |
| |
| #ifndef _LINUX_THREAD_INFO_H |
| #define _LINUX_THREAD_INFO_H |
| |
| #include <linux/types.h> |
| #include <linux/bug.h> |
| |
| struct timespec; |
| struct compat_timespec; |
| |
| #ifdef CONFIG_THREAD_INFO_IN_TASK |
| struct thread_info { |
| unsigned long flags; /* low level flags */ |
| }; |
| |
| #define INIT_THREAD_INFO(tsk) \ |
| { \ |
| .flags = 0, \ |
| } |
| #endif |
| |
| #ifdef CONFIG_THREAD_INFO_IN_TASK |
| #define current_thread_info() ((struct thread_info *)current) |
| #endif |
| |
| /* |
| * System call restart block. |
| */ |
| struct restart_block { |
| long (*fn)(struct restart_block *); |
| union { |
| /* For futex_wait and futex_wait_requeue_pi */ |
| struct { |
| u32 __user *uaddr; |
| u32 val; |
| u32 flags; |
| u32 bitset; |
| u64 time; |
| u32 __user *uaddr2; |
| } futex; |
| /* For nanosleep */ |
| struct { |
| clockid_t clockid; |
| struct timespec __user *rmtp; |
| #ifdef CONFIG_COMPAT |
| struct compat_timespec __user *compat_rmtp; |
| #endif |
| u64 expires; |
| } nanosleep; |
| /* For poll */ |
| struct { |
| struct pollfd __user *ufds; |
| int nfds; |
| int has_timeout; |
| unsigned long tv_sec; |
| unsigned long tv_nsec; |
| } poll; |
| }; |
| }; |
| |
| extern long do_no_restart_syscall(struct restart_block *parm); |
| |
| #include <linux/bitops.h> |
| #include <asm/thread_info.h> |
| |
| #ifdef __KERNEL__ |
| |
| #ifdef CONFIG_DEBUG_STACK_USAGE |
| # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ |
| __GFP_ZERO) |
| #else |
| # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) |
| #endif |
| |
| /* |
| * flag set/clear/test wrappers |
| * - pass TIF_xxxx constants to these functions |
| */ |
| |
| static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| #define set_thread_flag(flag) \ |
| set_ti_thread_flag(current_thread_info(), flag) |
| #define clear_thread_flag(flag) \ |
| clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_set_thread_flag(flag) \ |
| test_and_set_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_clear_thread_flag(flag) \ |
| test_and_clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_thread_flag(flag) \ |
| test_ti_thread_flag(current_thread_info(), flag) |
| |
| #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
| |
| #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
| static inline int arch_within_stack_frames(const void * const stack, |
| const void * const stackend, |
| const void *obj, unsigned long len) |
| { |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_HARDENED_USERCOPY |
| extern void __check_object_size(const void *ptr, unsigned long n, |
| bool to_user); |
| |
| static __always_inline void check_object_size(const void *ptr, unsigned long n, |
| bool to_user) |
| { |
| if (!__builtin_constant_p(n)) |
| __check_object_size(ptr, n, to_user); |
| } |
| #else |
| static inline void check_object_size(const void *ptr, unsigned long n, |
| bool to_user) |
| { } |
| #endif /* CONFIG_HARDENED_USERCOPY */ |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_THREAD_INFO_H */ |