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146 lines
4.2 KiB
146 lines
4.2 KiB
/* thread_info.h: common low-level thread information accessors |
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* |
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* Copyright (C) 2002 David Howells (dhowells@redhat.com) |
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* - Incorporating suggestions made by Linus Torvalds |
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*/ |
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#ifndef _LINUX_THREAD_INFO_H |
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#define _LINUX_THREAD_INFO_H |
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#include <linux/types.h> |
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#include <linux/bug.h> |
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#include <linux/restart_block.h> |
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#ifdef CONFIG_THREAD_INFO_IN_TASK |
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/* |
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* For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the |
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* definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, |
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* including <asm/current.h> can cause a circular dependency on some platforms. |
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*/ |
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#include <asm/current.h> |
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#define current_thread_info() ((struct thread_info *)current) |
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#endif |
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#include <linux/bitops.h> |
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#include <asm/thread_info.h> |
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#ifdef __KERNEL__ |
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#ifdef CONFIG_DEBUG_STACK_USAGE |
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# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) |
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#else |
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# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK) |
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#endif |
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/* |
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* flag set/clear/test wrappers |
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* - pass TIF_xxxx constants to these functions |
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*/ |
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static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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set_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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clear_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
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} |
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static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
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{ |
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return test_bit(flag, (unsigned long *)&ti->flags); |
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} |
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#define set_thread_flag(flag) \ |
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set_ti_thread_flag(current_thread_info(), flag) |
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#define clear_thread_flag(flag) \ |
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clear_ti_thread_flag(current_thread_info(), flag) |
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#define test_and_set_thread_flag(flag) \ |
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test_and_set_ti_thread_flag(current_thread_info(), flag) |
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#define test_and_clear_thread_flag(flag) \ |
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test_and_clear_ti_thread_flag(current_thread_info(), flag) |
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#define test_thread_flag(flag) \ |
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test_ti_thread_flag(current_thread_info(), flag) |
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#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
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#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK |
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/* |
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* An arch can define its own version of set_restore_sigmask() to get the |
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* job done however works, with or without TIF_RESTORE_SIGMASK. |
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*/ |
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#define HAVE_SET_RESTORE_SIGMASK 1 |
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/** |
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* set_restore_sigmask() - make sure saved_sigmask processing gets done |
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* |
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* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code |
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* will run before returning to user mode, to process the flag. For |
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* all callers, TIF_SIGPENDING is already set or it's no harm to set |
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* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the |
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* arch code will notice on return to user mode, in case those bits |
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* are scarce. We set TIF_SIGPENDING here to ensure that the arch |
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* signal code always gets run when TIF_RESTORE_SIGMASK is set. |
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*/ |
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static inline void set_restore_sigmask(void) |
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{ |
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set_thread_flag(TIF_RESTORE_SIGMASK); |
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WARN_ON(!test_thread_flag(TIF_SIGPENDING)); |
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} |
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static inline void clear_restore_sigmask(void) |
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{ |
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clear_thread_flag(TIF_RESTORE_SIGMASK); |
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} |
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static inline bool test_restore_sigmask(void) |
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{ |
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return test_thread_flag(TIF_RESTORE_SIGMASK); |
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} |
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static inline bool test_and_clear_restore_sigmask(void) |
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{ |
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return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); |
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} |
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#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ |
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#ifndef HAVE_SET_RESTORE_SIGMASK |
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#error "no set_restore_sigmask() provided and default one won't work" |
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#endif |
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#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
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static inline int arch_within_stack_frames(const void * const stack, |
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const void * const stackend, |
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const void *obj, unsigned long len) |
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{ |
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return 0; |
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} |
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#endif |
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#ifdef CONFIG_HARDENED_USERCOPY |
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extern void __check_object_size(const void *ptr, unsigned long n, |
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bool to_user); |
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static __always_inline void check_object_size(const void *ptr, unsigned long n, |
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bool to_user) |
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{ |
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if (!__builtin_constant_p(n)) |
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__check_object_size(ptr, n, to_user); |
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} |
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#else |
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static inline void check_object_size(const void *ptr, unsigned long n, |
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bool to_user) |
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{ } |
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#endif /* CONFIG_HARDENED_USERCOPY */ |
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#endif /* __KERNEL__ */ |
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#endif /* _LINUX_THREAD_INFO_H */
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