/* 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

  #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 */